diff --git a/alpha_todo.txt b/alpha_todo.txt
index bf7cbc8..62342af 100644
--- a/alpha_todo.txt
+++ b/alpha_todo.txt
@@ -15,21 +15,21 @@ Simple to-do for Druid Alpha 0.2.0
 
 + button add key trigger
 + button and hover click restriction zone?
++ button polish, actions
++ better scroll size management, check different cases. So implicit now
++ better callbacks for every components
 
 - unify component api (get/set/to and other general stuff)
-- better callbacks for every components
-- better scroll size management, check different cases. So implicit now
 - better grid + scroll management
 - better default style, add template for custom style
-- add input_text component for alpha release
 - compare with gooey
 - add docs for all components
 - add docs folder for every component with gifs? Solutions
 - remove component autoremove all children component
 
-- button polish, actions
 
 -- Low
+- add input_text component for alpha release
 - add code template and example for user components
 - custom input settings (name of touch, text, etc)
 - add good examples with template and/or nodes (basic component no use any of them)
diff --git a/docs/index.html b/docs/index.html
index 8e850b0..aa797fc 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -145,7 +145,7 @@
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.4.6</a></i>
-<i style="float:right;">Last updated 2020-02-24 00:03:02 </i>
+<i style="float:right;">Last updated 2020-03-21 20:02:23 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>
diff --git a/druid/base/back_handler.lua b/druid/base/back_handler.lua
index 2431f80..00414c8 100644
--- a/druid/base/back_handler.lua
+++ b/druid/base/back_handler.lua
@@ -1,6 +1,14 @@
 --- Component to handle back key (android, backspace)
 -- @module druid.back_handler
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_back On back handler callback
+
+--- Component fields
+-- @table Fields
+-- @tfield any params Params to click callbacks
+
 local Event = require("druid.event")
 local const = require("druid.const")
 local component = require("druid.component")
@@ -10,11 +18,9 @@ local M = component.create("back_handler", { const.ON_INPUT })
 
 --- Component init function
 -- @function back_handler:init
--- @tparam table self Component instance
 -- @tparam callback callback On back button
 -- @tparam[opt] params Callback argument
 function M.init(self, callback, params)
-	self.callback = callback
 	self.params = params
 
 	self.on_back = Event(callback)
diff --git a/druid/base/blocker.lua b/druid/base/blocker.lua
index 303d703..e32239e 100644
--- a/druid/base/blocker.lua
+++ b/druid/base/blocker.lua
@@ -1,9 +1,17 @@
---- Component to block input on specify zone (node)
+--- Component to block input on specify zone by node
 -- @module druid.blocker
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_click On release button callback
+-- @tfield druid_event on_enable_change On enable/disable callback
+
+--- Component fields
+-- @table Fields
+-- @tfield node node Trigger node
+
 local Event = require("druid.event")
 local const = require("druid.const")
-local helper = require("druid.helper")
 local component = require("druid.component")
 
 local M = component.create("blocker", { const.ON_INPUT_HIGH })
@@ -22,7 +30,7 @@ function M.on_input(self, action_id, action)
 		return false
 	end
 
-	if not helper.is_enabled(self.node) then
+	if not self:is_enabled(self.node) then
 		return false
 	end
 
@@ -34,13 +42,19 @@ function M.on_input(self, action_id, action)
 end
 
 
+--- Set enabled blocker component state
+-- @function blocker:set_enabled
+-- @tparam bool state Enabled state
 function M.set_enabled(self, state)
-
+	gui.set_enabled(self.node, state)
 end
 
 
+--- Return blocked enabled state
+-- @function blocker:is_enabled
+-- @treturn bool True, if blocker is enabled
 function M.is_enabled(self, state)
-
+	return gui.is_enabled(self.node)
 end
 
 
diff --git a/druid/base/button.lua b/druid/base/button.lua
index 7b940d9..9c431f9 100644
--- a/druid/base/button.lua
+++ b/druid/base/button.lua
@@ -1,9 +1,6 @@
 --- Component to handle basic GUI button
 -- @module druid.button
 
---- Button gui component
---@class druid
-
 --- Component events
 -- @table Events
 -- @tfield druid_event on_click On release button callback
@@ -144,7 +141,6 @@ end
 
 --- Component init function
 -- @function button:init
--- @tparam table self Component instance
 -- @tparam node node Gui node
 -- @tparam function callback Button callback
 -- @tparam[opt] table params Button callback params
@@ -246,6 +242,9 @@ function M.on_input_interrupt(self)
 end
 
 
+--- Set enabled button component state
+-- @function button:set_enabled
+-- @tparam bool state Enabled state
 function M.set_enabled(self, state)
 	self.disabled = not state
 	if self._style.on_set_enabled then
@@ -254,7 +253,10 @@ function M.set_enabled(self, state)
 end
 
 
-function M.get_enabled(self)
+--- Return button enabled state
+-- @function button:is_enabled
+-- @treturn bool True, if button is enabled
+function M.is_enabled(self)
 	return not self.disabled
 end
 
@@ -262,7 +264,6 @@ end
 --- Strict button click area. Useful for
 -- no click events outside stencil node
 -- @function button:set_click_zone
--- @tparam table self Component instance
 -- @tparam node zone Gui node
 function M.set_click_zone(self, zone)
 	self.click_zone = self:get_node(zone)
diff --git a/druid/base/checkbox.lua b/druid/base/checkbox.lua
index 723decd..7770be9 100644
--- a/druid/base/checkbox.lua
+++ b/druid/base/checkbox.lua
@@ -1,13 +1,54 @@
 --- Druid checkbox component
 -- @module druid.checkbox
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_change_state On change state callback
+
+--- Component fields
+-- @table Fields
+-- @tfield node node Visual node
+-- @tfield[opt=node] node click_node Button trigger node
+-- @tfield druid.button button Button component from click_node
+
+--- Component style params
+-- @table Style
+-- @tfield function on_change_state (self, node, state)
+
 local Event = require("druid.event")
 local component = require("druid.component")
 
 local M = component.create("checkbox")
 
 
-function M.set_state(self, state, is_silence)
+local function on_click(self)
+	M.set_state(self, not self.state)
+end
+
+
+--- Component init function
+-- @function checkbox:init
+-- @tparam node node Gui node
+-- @tparam function callback Checkbox callback
+-- @tparam[opt=node] node click node Trigger node, by default equals to node
+function M.init(self, node, callback, click_node)
+	self.style = self:get_style()
+	self.druid = self:get_druid()
+	self.node = self:get_node(node)
+	self.click_node = self:get_node(click_node)
+
+	self.button = self.druid:new_button(self.click_node or self.node, on_click)
+	M.set_state(self, false, true)
+
+	self.on_change_state = Event(callback)
+end
+
+
+--- Set checkbox state
+-- @function checkbox:set_state
+-- @tparam bool state Checkbox state
+-- @tparam bool is_silent Don't trigger on_change_state if true
+function M.set_state(self, state, is_silent)
 	if self.state == state then
 		return
 	end
@@ -17,34 +58,18 @@ function M.set_state(self, state, is_silence)
 		self.style.on_change_state(self, self.node, state)
 	end
 
-	if not is_silence and self.callback then
+	if not is_silent then
 		self.on_change_state:trigger(self:get_context(), state)
 	end
 end
 
 
+--- Return checkbox state
+-- @function checkbox:get_state
+-- @treturn bool Checkbox state
 function M.get_state(self)
 	return self.state
 end
 
 
-local function on_click(self)
-	M.set_state(self, not self.state)
-end
-
-
-function M.init(self, node, callback, click_node)
-	self.style = self:get_style()
-	self.druid = self:get_druid()
-	self.node = self:get_node(node)
-	self.click_node = self:get_node(click_node)
-	self.callback = callback
-
-	self.button = self.druid:new_button(self.click_node or self.node, on_click)
-	M.set_state(self, false, true)
-
-	self.on_change_state = Event(callback)
-end
-
-
 return M
diff --git a/druid/base/checkbox_group.lua b/druid/base/checkbox_group.lua
index 3f5ed11..dd9a94a 100644
--- a/druid/base/checkbox_group.lua
+++ b/druid/base/checkbox_group.lua
@@ -1,32 +1,25 @@
---- Checkboux group module
+--- Checkbox group module
 -- @module druid.checkbox_group
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_checkbox_click On any checkbox click
+
+--- Component fields
+-- @table Fields
+-- @tfield table checkboxes Array of checkbox components
+
 local Event = require("druid.event")
 local component = require("druid.component")
 
 local M = component.create("checkbox_group")
 
 
-function M.set_state(self, indexes)
-	for i = 1, #indexes do
-		if self.checkboxes[i] then
-			self.checkboxes[i]:set_state(indexes[i], true)
-		end
-	end
-end
-
-
-function M.get_state(self)
-	local result = {}
-
-	for i = 1, #self.checkboxes do
-		table.insert(result, self.checkboxes[i]:get_state())
-	end
-
-	return result
-end
-
-
+--- Component init function
+-- @function checkbox_group:init
+-- @tparam node[] node Array of gui node
+-- @tparam function callback Checkbox callback
+-- @tparam[opt=node] node[] click node Array of trigger nodes, by default equals to nodes
 function M.init(self, nodes, callback, click_nodes)
 	self.druid = self:get_druid()
 	self.checkboxes = {}
@@ -44,4 +37,30 @@ function M.init(self, nodes, callback, click_nodes)
 end
 
 
+--- Set checkbox group state
+-- @function checkbox_group:set_state
+-- @tparam bool[] state Array of checkbox state
+function M.set_state(self, indexes)
+	for i = 1, #indexes do
+		if self.checkboxes[i] then
+			self.checkboxes[i]:set_state(indexes[i], true)
+		end
+	end
+end
+
+
+--- Return checkbox group state
+-- @function checkbox_group:get_state
+-- @treturn bool[] Array if checkboxes state
+function M.get_state(self)
+	local result = {}
+
+	for i = 1, #self.checkboxes do
+		table.insert(result, self.checkboxes[i]:get_state())
+	end
+
+	return result
+end
+
+
 return M
diff --git a/druid/base/grid.lua b/druid/base/grid.lua
index 6dad84d..86e0444 100644
--- a/druid/base/grid.lua
+++ b/druid/base/grid.lua
@@ -2,12 +2,34 @@
 -- Grid can anchor your elements, get content size and other
 -- @module druid.grid
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_add_item On item add callback
+-- @tfield druid_event on_remove_item On item remove callback
+-- @tfield druid_event on_clear On grid clear callback
+-- @tfield druid_event on_update_positions On update item positions callback
+
+--- Component fields
+-- @table Fields
+-- @tfield node parent Parent gui node
+-- @tfield node[] nodes List of all grid nodes
+-- @tfield vector3 offset Item distance between each other items
+-- @tfield vector3 anchor Item anchor
+-- @tfield vector3 node_size Item size
+-- @tfield vector4 border The size of item content
+-- @tfield vector3 border_offer The border offset for correct anchor calculations
+
 local Event = require("druid.event")
 local component = require("druid.component")
 
 local M = component.create("grid")
 
 
+--- Component init function
+-- @function grid:init
+-- @tparam node parent The gui node parent, where items will be placed
+-- @tparam node element Element prefab. Need to get it size
+-- @tparam[opt=1] number in_row How many nodes in row can be placed
 function M.init(self, parent, element, in_row)
 	self.parent = self:get_node(parent)
 	self.nodes = {}
@@ -55,6 +77,7 @@ local function get_pos(self, index)
 
 	temp_pos.x = col * (self.node_size.x + self.offset.x) - self.border_offset.x
 	temp_pos.y = -row * (self.node_size.y + self.offset.y) - self.border_offset.y
+	temp_pos.z = 0
 
 	return temp_pos
 end
@@ -70,18 +93,29 @@ local function update_pos(self)
 end
 
 
+
+--- Set grid items offset, the distance between items
+-- @function grid:set_offset
+-- @tparam vector3 offset Offset
 function M.set_offset(self, offset)
 	self.offset = offset
 	update_pos(self)
 end
 
 
+--- Set grid anchor
+-- @function grid:set_anchor
+-- @tparam vector3 acnhor Anchor
 function M.set_anchor(self, anchor)
 	self.anchor = anchor
 	update_pos(self)
 end
 
 
+--- Add new item to the grid
+-- @function grid:add
+--	@tparam node item Gui node
+-- @tparam[opt] number index The item position. By default add as last item
 function M.add(self, item, index)
 	index = index or (#self.nodes + 1)
 	table.insert(self.nodes, index, item)
@@ -95,6 +129,9 @@ function M.add(self, item, index)
 end
 
 
+--- Return grid content size
+-- @function grid:get_size
+-- @treturn vector3 The grid content size
 function M.get_size(self)
 	return vmath.vector3(
 		self.border.z - self.border.x,
@@ -103,6 +140,9 @@ function M.get_size(self)
 end
 
 
+--- Return array of all node positions
+-- @function grid:get_all_pos
+-- @treturn vector3[] All grid node positions
 function M.get_all_pos(self)
 	local result = {}
 	for i = 1, #self.nodes do
@@ -113,6 +153,8 @@ function M.get_all_pos(self)
 end
 
 
+--- Clear all items from the grid
+-- @function grid:clear
 function M.clear(self)
 	for i = 1, #self.nodes do
 		gui.delete_node(self.nodes[i])
diff --git a/druid/base/hover.lua b/druid/base/hover.lua
index a535af9..a38cda0 100644
--- a/druid/base/hover.lua
+++ b/druid/base/hover.lua
@@ -1,5 +1,9 @@
 --- Component to handle hover node interaction
--- @module druid.input
+-- @module druid.hover
+
+--- Component events
+-- @table Events
+-- @tfield druid_event on_hover On hover callback
 
 local Event = require("druid.event")
 local const = require("druid.const")
@@ -11,7 +15,6 @@ local M = component.create("hover", { const.ON_INPUT })
 
 --- Component init function
 -- @function hover:init
--- @tparam table self Component instance
 -- @tparam node node Gui node
 -- @tparam function on_hover_callback Hover callback
 function M.init(self, node, on_hover_callback)
@@ -24,14 +27,6 @@ function M.init(self, node, on_hover_callback)
 end
 
 
-function M.set_hover(self, state)
-	if self._is_hovered ~= state then
-		self._is_hovered = state
-		self.on_hover:trigger(self:get_context(), state)
-	end
-end
-
-
 function M.on_input(self, action_id, action)
 	if action_id ~= const.ACTION_TOUCH then
 		return
@@ -64,10 +59,20 @@ function M.on_input_interrupt(self)
 end
 
 
+--- Set hover state
+-- @function hover:set_hover
+-- @tparam bool state The hover state
+function M.set_hover(self, state)
+	if self._is_hovered ~= state then
+		self._is_hovered = state
+		self.on_hover:trigger(self:get_context(), state)
+	end
+end
+
+
 --- Strict button click area. Useful for
 -- no click events outside stencil node
 -- @function button:set_click_zone
--- @tparam table self Component instance
 -- @tparam node zone Gui node
 function M.set_click_zone(self, zone)
 	self.click_zone = self:get_node(zone)
diff --git a/druid/base/input.lua b/druid/base/input.lua
index 3b05fb8..21079a2 100644
--- a/druid/base/input.lua
+++ b/druid/base/input.lua
@@ -1,4 +1,5 @@
---- Druid input text component
+--- Druid input text component.
+-- Carry on user text input
 -- @local unimplemented
 -- @module druid.input
 
diff --git a/druid/base/lang_text.lua b/druid/base/lang_text.lua
index 760190e..5c81c03 100644
--- a/druid/base/lang_text.lua
+++ b/druid/base/lang_text.lua
@@ -2,6 +2,15 @@
 -- Good working with localization system
 -- @module druid.lang_text
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_change On change text callback
+
+--- Component fields
+-- @table Fields
+-- @tfield druid.text text The text component
+
+local Event = require("druid.event")
 local const = require("druid.const")
 local settings = require("druid.system.settings")
 local component = require("druid.component")
@@ -9,31 +18,23 @@ local component = require("druid.component")
 local M = component.create("lang_text", { const.ON_CHANGE_LANGUAGE })
 
 
-function M.init(self, node, lang_id, no_adjust)
+--- Component init function
+-- @function lang_text:init
+-- @tparam node node The text node
+-- @tparam string locale_id Default locale id
+-- @tparam bool no_adjust If true, will not correct text size
+function M.init(self, node, locale_id, no_adjust)
 	self.druid = self:get_druid()
-	self.text = self.druid:new_text(node, lang_id, no_adjust)
-	self:translate(lang_id)
+	self.text = self.druid:new_text(node, locale_id, no_adjust)
+
+	self.on_change = Event()
+
+	self:translate(locale_id)
 
 	return self
 end
 
 
-function M.set_to(self, text)
-	self.last_locale = false
-	self.text:set_to(text)
-end
-
-
---- Translate the text by locale_id
--- @function text:translate
--- @tparam table self Component instance
--- @tparam string locale_id Locale id
-function M.translate(self, locale_id)
-	self.last_locale = locale_id or self.last_locale
-	self.text:set_to(settings.get_text(self.last_locale))
-end
-
-
 function M.on_change_language(self)
 	if self.last_locale then
 		M.translate(self)
@@ -41,4 +42,23 @@ function M.on_change_language(self)
 end
 
 
+--- Setup raw text to lang_text component
+-- @function lang_text:set_to
+-- @tparam string text Text for text node
+function M.set_to(self, text)
+	self.last_locale = false
+	self.text:set_to(text)
+	self.on_change:trigger()
+end
+
+
+--- Translate the text by locale_id
+-- @function lang_text:translate
+-- @tparam string locale_id Locale id
+function M.translate(self, locale_id)
+	self.last_locale = locale_id or self.last_locale
+	self.text:set_to(settings.get_text(self.last_locale))
+end
+
+
 return M
diff --git a/druid/base/progress.lua b/druid/base/progress.lua
index 251c38f..2aa21e8 100644
--- a/druid/base/progress.lua
+++ b/druid/base/progress.lua
@@ -1,6 +1,26 @@
---- Basic progress bar component
+--- Basic progress bar component.
+-- For correct progress bar init it should be in max size from gui
 -- @module druid.progress
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_change On progress bar change callback
+
+--- Component fields
+-- @table Fields
+-- @tfield node node Progress bar fill node
+-- @tfield string key The progress bar direction
+-- @tfield vector3 scale Current progress bar scale
+-- @tfield vector3 size Current progress bar size
+-- @tfield number max_size Maximum size of progress bar
+-- @tfield vector4 slice Progress bar slice9 settings
+
+--- Component style params
+-- @table Style
+-- @tfield number SPEED Progress bas fill rate. More -> faster
+-- @tfield number MIN_DELTA Minimum step to fill progress bar
+
+local Event = require("druid.event")
 local const = require("druid.const")
 local helper = require("druid.helper")
 local component = require("druid.component")
@@ -8,34 +28,6 @@ local component = require("druid.component")
 local M = component.create("progress", { const.ON_UPDATE })
 
 
---- Component init function
--- @function progress:init
--- @tparam table self Component instance
--- @tparam string|node node Progress bar fill node or node name
--- @tparam string key Progress bar direction (x or y)
--- @tparam number init_value Initial value of progress bar
-function M.init(self, node, key, init_value)
-	assert(key == const.SIDE.X or const.SIDE.Y, "Progress bar key should be 'x' or 'y'")
-
-	self.prop = hash("scale."..key)
-	self.key = key
-
-	self.style = self:get_style()
-	self.node = self:get_node(node)
-	self.scale = gui.get_scale(self.node)
-	self.size = gui.get_size(self.node)
-	self.max_size = self.size[self.key]
-	self.slice = gui.get_slice9(self.node)
-	if key == const.SIDE.X then
-		self.slice_size = self.slice.x + self.slice.z
-	else
-		self.slice_size = self.slice.y + self.slice.w
-	end
-
-	self:set_to(init_value or 1)
-end
-
-
 local function check_steps(self, from, to, exactly)
 	if not self.steps then
 		return
@@ -58,7 +50,7 @@ local function check_steps(self, from, to, exactly)
 end
 
 
-local function set_bar_to(self, set_to, is_silence)
+local function set_bar_to(self, set_to, is_silent)
 	local prev_value = self.last_value
 	self.last_value = set_to
 
@@ -72,73 +64,38 @@ local function set_bar_to(self, set_to, is_silence)
 	self.size[self.key] = size
 	gui.set_size(self.node, self.size)
 
-	if not is_silence then
+	if not is_silent then
 		check_steps(self, prev_value, set_to)
 	end
 end
 
 
---- Fill a progress bar and stop progress animation
--- @function progress:empty
--- @tparam table self Component instance
-function M.fill(self)
-	set_bar_to(self, 1, true)
-end
+--- Component init function
+-- @function progress:init
+-- @tparam string|node node Progress bar fill node or node name
+-- @tparam string key Progress bar direction: const.SIDE.X or const.SIDE.Y
+-- @tparam number init_value Initial value of progress bar
+function M.init(self, node, key, init_value)
+	assert(key == const.SIDE.X or const.SIDE.Y, "Progress bar key should be 'x' or 'y'")
 
+	self.prop = hash("scale."..key)
+	self.key = key
 
---- Empty a progress bar
--- @function progress:empty
--- @tparam table self Component instance
-function M.empty(self)
-	set_bar_to(self, 0, true)
-end
-
-
---- Instant fill progress bar to value
--- @function progress:set_to
--- @tparam table self Component instance
--- @tparam number to Progress bar value, from 0 to 1
-function M.set_to(self, to)
-	set_bar_to(self, to)
-end
-
-
---- Return current progress bar value
--- @function progress:get
--- @tparam table self Component instance
-function M.get(self)
-	return self.last_value
-end
-
-
---- Set points on progress bar to fire the callback
--- @function progress:set_steps
--- @tparam table self Component instance
--- @tparam table steps Array of progress bar values
--- @tparam function callback Callback on intersect step value
-function M.set_steps(self, steps, callback)
-	self.steps = steps
-	self.step_callback = callback
-end
-
-
---- Start animation of a progress bar
--- @function progress:to
--- @tparam table self Component instance
--- @tparam number to value between 0..1
--- @tparam[opt] function callback Callback on animation ends
-function M.to(self, to, callback)
-	to = helper.clamp(to, 0, 1)
-	-- cause of float error
-	local value = helper.round(to, 5)
-	if value ~= self.last_value then
-		self.target = value
-		self.target_callback = callback
+	self.style = self:get_style()
+	self.node = self:get_node(node)
+	self.scale = gui.get_scale(self.node)
+	self.size = gui.get_size(self.node)
+	self.max_size = self.size[self.key]
+	self.slice = gui.get_slice9(self.node)
+	if key == const.SIDE.X then
+		self.slice_size = self.slice.x + self.slice.z
 	else
-		if callback then
-			callback(self:get_context(), to)
-		end
+		self.slice_size = self.slice.y + self.slice.w
 	end
+
+	self.on_change = Event()
+
+	self:set_to(init_value or 1)
 end
 
 
@@ -162,4 +119,63 @@ function M.update(self, dt)
 end
 
 
+--- Fill a progress bar and stop progress animation
+-- @function progress:fill
+function M.fill(self)
+	set_bar_to(self, 1, true)
+end
+
+
+--- Empty a progress bar
+-- @function progress:empty
+function M.empty(self)
+	set_bar_to(self, 0, true)
+end
+
+
+--- Instant fill progress bar to value
+-- @function progress:set_to
+-- @tparam number to Progress bar value, from 0 to 1
+function M.set_to(self, to)
+	set_bar_to(self, to)
+end
+
+
+--- Return current progress bar value
+-- @function progress:get
+function M.get(self)
+	return self.last_value
+end
+
+
+--- Set points on progress bar to fire the callback
+-- @function progress:set_steps
+-- @tparam number[] steps Array of progress bar values
+-- @tparam function callback Callback on intersect step value
+-- @usage progress:set_steps({0, 0.3, 0.6, 1}, function(self, step) end)
+function M.set_steps(self, steps, callback)
+	self.steps = steps
+	self.step_callback = callback
+end
+
+
+--- Start animation of a progress bar
+-- @function progress:to
+-- @tparam number to value between 0..1
+-- @tparam[opt] function callback Callback on animation ends
+function M.to(self, to, callback)
+	to = helper.clamp(to, 0, 1)
+	-- cause of float error
+	local value = helper.round(to, 5)
+	if value ~= self.last_value then
+		self.target = value
+		self.target_callback = callback
+	else
+		if callback then
+			callback(self:get_context(), to)
+		end
+	end
+end
+
+
 return M
diff --git a/druid/base/radio_group.lua b/druid/base/radio_group.lua
index b5e2f97..a446d02 100644
--- a/druid/base/radio_group.lua
+++ b/druid/base/radio_group.lua
@@ -1,6 +1,15 @@
 --- Radio group module
 -- @module druid.radio_group
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_radio_click On any checkbox click
+
+--- Component fields
+-- @table Fields
+-- @tfield table checkboxes Array of checkbox components
+
+local Event = require("druid.event")
 local component = require("druid.component")
 
 local M = component.create("radio_group")
@@ -11,17 +20,43 @@ local function on_checkbox_click(self, index)
 		self.checkboxes[i]:set_state(i == index, true)
 	end
 
-	if self.callback then
-		self.callback(self:get_context(), index)
+	self.on_radio_click:trigger(self:get_context(), index)
+end
+
+
+--- Component init function
+-- @function radio_group:init
+-- @tparam node[] node Array of gui node
+-- @tparam function callback Radio callback
+-- @tparam[opt=node] node[] click node Array of trigger nodes, by default equals to nodes
+function M.init(self, nodes, callback, click_nodes)
+	self.druid = self:get_druid()
+	self.checkboxes = {}
+
+	self.on_radio_click = Event(callback)
+
+	for i = 1, #nodes do
+		local click_node = click_nodes and click_nodes[i] or nil
+		local checkbox = self.druid:new_checkbox(nodes[i], function()
+			on_checkbox_click(self, i)
+		end, click_node)
+
+		table.insert(self.checkboxes, checkbox)
 	end
 end
 
 
+--- Set radio group state
+-- @function radio_group:set_state
+-- @tparam bool[] state Array of checkbox state
 function M.set_state(self, index)
 	on_checkbox_click(self, index)
 end
 
 
+--- Return radio group state
+-- @function radio_group:get_state
+-- @treturn bool[] Array if checkboxes state
 function M.get_state(self)
 	local result = -1
 
@@ -36,20 +71,4 @@ function M.get_state(self)
 end
 
 
-function M.init(self, nodes, callback, click_nodes)
-	self.druid = self:get_druid()
-	self.checkboxes = {}
-	self.callback = callback
-
-	for i = 1, #nodes do
-		local click_node = click_nodes and click_nodes[i] or nil
-		local checkbox = self.druid:new_checkbox(nodes[i], function()
-			on_checkbox_click(self, i)
-		end, click_node)
-
-		table.insert(self.checkboxes, checkbox)
-	end
-end
-
-
 return M
diff --git a/druid/base/scroll.lua b/druid/base/scroll.lua
index f95cdd9..4a437c2 100644
--- a/druid/base/scroll.lua
+++ b/druid/base/scroll.lua
@@ -1,6 +1,41 @@
---- Component to handle scroll content
+--- Component to handle scroll content.
+-- Scroll consist from two nodes: scroll parent and scroll input
+-- Scroll input the user input zone, it's static
+-- Scroll parent the scroll moving part, it will change position.
+-- Setup initial scroll size by changing scroll parent size. If scroll parent
+-- size will be less than scroll_input size, no scroll is available. For scroll
+-- parent size should be more than input size
 -- @module druid.scroll
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_scroll On scroll move callback
+-- @tfield druid_event on_scroll_to On scroll_to function callback
+-- @tfield druid_event on_point_scroll On scroll_to_index function callbck
+
+--- Component fields
+-- @table Fields
+-- @tfield node node Scroll parent node
+-- @tfield node input_zone Scroll input node
+-- @tfield vector3 zone_size Current scroll content size
+-- @tfield number soft_size Soft zone size from style table
+-- @tfield vector3 center_offset Distance from node to node's center
+-- @tfield bool is_inert Flag, if scroll now moving by inertion
+-- @tfield vector3 inert Current inert speed
+-- @tfield vector3 pos Current scroll posisition
+-- @tfield vector3 target Current scroll target position
+
+--- Component style params
+-- @table Style
+-- @tfield number FRICT_HOLD Multiplier for inertion, while touching
+-- @tfield number FRICT Multiplier for free inertion
+-- @tfield number INERT_THRESHOLD Scroll speed to stop inertion
+-- @tfield number INERT_SPEED Multiplier for inertion speed
+-- @tfield number DEADZONE Deadzone for start scrol in pixels
+-- @tfield number SOFT_ZONE_SIZE Size of outside zone in pixels (for scroll back moving)
+-- @tfield number BACK_SPEED Scroll back returning lerp speed
+-- @tfield number ANIM_SPEED Scroll gui.animation speed for scroll_to function
+
 local Event = require("druid.event")
 local helper = require("druid.helper")
 local const = require("druid.const")
@@ -46,39 +81,6 @@ local function update_border(self)
 end
 
 
-function M.init(self, scroll_parent, input_zone, border)
-	self.style = self:get_style()
-	self.node = self:get_node(scroll_parent)
-	self.input_zone = self:get_node(input_zone)
-
-	self.zone_size = gui.get_size(self.input_zone)
-	self.soft_size = self.style.SOFT_ZONE_SIZE
-
-	-- Distance from node to node's center
-	local offset = helper.get_pivot_offset(gui.get_pivot(self.input_zone))
-	self.center_offset = vmath.vector3(self.zone_size)
-	self.center_offset.x = self.center_offset.x * offset.x
-	self.center_offset.y = self.center_offset.y * offset.y
-
-	self.is_inert = true
-	self.inert = vmath.vector3(0)
-	self.pos = gui.get_position(self.node)
-	self.target = vmath.vector3(self.pos)
-
-	self.input = {
-		touch = false,
-		start_x = 0,
-		start_y = 0,
-		side = false,
-	}
-
-	update_border(self)
-
-	self.on_scroll = Event()
-	self.on_scroll_to = Event()
-	self.on_point_scroll = Event()
-end
-
 
 local function set_pos(self, pos)
 	if self.pos.x ~= pos.x or self.pos.y ~= pos.y then
@@ -146,6 +148,7 @@ end
 --- Find closer point of interest
 -- if no inert, scroll to next point by scroll direction
 -- if inert, find next point by scroll director
+-- @local
 local function check_points(self)
 	if not self.points then
 		return
@@ -236,17 +239,6 @@ local function cancel_animate(self)
 end
 
 
-function M.update(self, dt)
-	if self.input.touch then
-		if M.current_scroll == self then
-			update_hand_scroll(self, dt)
-		end
-	else
-		update_free_inert(self, dt)
-	end
-end
-
-
 local function add_delta(self, dx, dy)
 	local t = self.target
 	local b = self.border
@@ -295,6 +287,55 @@ local function add_delta(self, dx, dy)
 end
 
 
+--- Component init function
+-- @function scroll:init
+-- @tparam node scroll_parent Gui node where placed scroll content. This node will change position
+-- @tparam node input_zone Gui node where input is catched
+function M.init(self, scroll_parent, input_zone)
+	self.style = self:get_style()
+	self.node = self:get_node(scroll_parent)
+	self.input_zone = self:get_node(input_zone)
+
+	self.zone_size = gui.get_size(self.input_zone)
+	self.soft_size = self.style.SOFT_ZONE_SIZE
+
+	-- Distance from node to node's center
+	local offset = helper.get_pivot_offset(gui.get_pivot(self.input_zone))
+	self.center_offset = vmath.vector3(self.zone_size)
+	self.center_offset.x = self.center_offset.x * offset.x
+	self.center_offset.y = self.center_offset.y * offset.y
+
+	self.is_inert = true
+	self.inert = vmath.vector3(0)
+	self.pos = gui.get_position(self.node)
+	self.target = vmath.vector3(self.pos)
+
+	self.input = {
+		touch = false,
+		start_x = 0,
+		start_y = 0,
+		side = false,
+	}
+
+	update_border(self)
+
+	self.on_scroll = Event()
+	self.on_scroll_to = Event()
+	self.on_point_scroll = Event()
+end
+
+
+function M.update(self, dt)
+	if self.input.touch then
+		if M.current_scroll == self then
+			update_hand_scroll(self, dt)
+		end
+	else
+		update_free_inert(self, dt)
+	end
+end
+
+
 function M.on_input(self, action_id, action)
 	if action_id ~= const.ACTION_TOUCH then
 		return false
@@ -377,9 +418,10 @@ function M.scroll_to(self, point, is_instant)
 		end)
 	end
 
-	self.on_scroll_to:trigger(self:get_context(), point, is_instant)
+	self.on_scroll_to:trigger(self:get_context(), target, is_instant)
 end
 
+
 --- Start scroll to target scroll percent
 -- @function scroll:scroll_to_percent
 -- @tparam point vector3 target percent
@@ -404,11 +446,11 @@ function M.scroll_to_percent(self, percent, is_instant)
 	M.scroll_to(self, pos, is_instant)
 end
 
+
 --- Scroll to item in scroll by point index
 -- @function scroll:init
--- @tparam table self Component instance
 -- @tparam number index Point index
--- @tparam[opt] boolean skip_cb If true, skip the point callback
+-- @tparam[opt] bool skip_cb If true, skip the point callback
 function M.scroll_to_index(self, index, skip_cb)
 	index = helper.clamp(index, 1, #self.points)
 
@@ -427,7 +469,6 @@ end
 --- Set points of interest.
 -- Scroll will always centered on closer points
 -- @function scroll:set_points
--- @tparam table self Component instance
 -- @tparam table points Array of vector3 points
 function M.set_points(self, points)
 	self.points = points
@@ -447,8 +488,7 @@ end
 -- If disabled, scroll through points (if exist)
 -- If no points, just simple drag without inertion
 -- @function scroll:set_inert
--- @tparam table self Component instance
--- @tparam boolean state Inert scroll state
+-- @tparam bool state Inert scroll state
 function M.set_inert(self, state)
 	self.is_inert = state
 end
@@ -456,7 +496,6 @@ end
 
 --- Set the callback on scrolling to point (if exist)
 -- @function scroll:on_point_move
--- @tparam table self Component instance
 -- @tparam function callback Callback on scroll to point of interest
 function M.on_point_move(self, callback)
 	self.on_point_scroll:subscribe(callback)
@@ -465,8 +504,7 @@ end
 
 --- Set the scroll possibly area
 -- @function scroll:set_border
--- @tparam table self Component instance
--- @tparam vmath.vector3 border Size of scrolling area
+-- @tparam vector3 border Size of scrolling area
 function M.set_border(self, content_size)
 	gui.set_size(self.node, content_size)
 	update_border(self)
@@ -475,8 +513,7 @@ end
 
 --- Return current scroll progress
 -- @function scroll:get_scroll_percent
--- @tparam table self Component instance
--- @return vmath.vector3 Scroll progress
+-- @treturn vector3 Scroll progress
 function M.get_scroll_percent(self)
 	local border = self.border
 	local size_x = math.abs(border.z - border.x)
diff --git a/druid/base/slider.lua b/druid/base/slider.lua
index 945c4e3..f5b8f13 100644
--- a/druid/base/slider.lua
+++ b/druid/base/slider.lua
@@ -1,6 +1,22 @@
 --- Druid slider component
 -- @module druid.slider
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_change_value On change value callback
+
+--- Component fields
+-- @table Fields
+-- @tfield node node Slider pin node
+-- @tfield vector3 start_pos Start pin node position
+-- @tfield vector3 pos Current pin node position
+-- @tfield vector3 target_pos Targer pin node position
+-- @tfield vector3 end_pos End pin node position
+-- @tfield number dist Length between start and end position
+-- @tfield bool is_drag Current drag state
+-- @tfield number value Current slider value
+
+
 local Event = require("druid.event")
 local helper = require("druid.helper")
 local const = require("druid.const")
@@ -14,6 +30,11 @@ local function on_change_value(self)
 end
 
 
+--- Component init function
+-- @function slider:init
+-- @tparam node node Gui pin node
+-- @tparam vector3 end_pos The end position of slider
+-- @tparam[opt] function callback On slider change callback
 function M.init(self, node, end_pos, callback)
 	self.node = self:get_node(node)
 
@@ -79,6 +100,10 @@ function M.on_input(self, action_id, action)
 end
 
 
+--- Set value for slider
+-- @function slider:set
+-- @tparam number value Value from 0 to 1
+-- @tparam[opt] bool is_silent Don't trigger event if true
 function M.set(self, value, is_silent)
 	value = helper.clamp(value, 0, 1)
 
diff --git a/druid/base/text.lua b/druid/base/text.lua
index 1c19c2f..436a4c7 100644
--- a/druid/base/text.lua
+++ b/druid/base/text.lua
@@ -1,7 +1,25 @@
---- Component to handle all GUI texts
--- Good working with localization system
+--- Component to handle all GUI texts.
+-- Druid text can adjust itself for text node size
+-- Text will never will be outside of his text size (even multiline)
 -- @module druid.text
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_set_text On set text callback
+-- @tfield druid_event on_update_text_scale On adjust text size callback
+-- @tfield druid_event on_set_pivot On change pivot callback
+
+--- Component fields
+-- @table Fields
+-- @tfield node node Text node
+-- @tfield vector3 pos Current text position
+-- @tfield vector3 start_scale Initial text node scale
+-- @tfield vector3 scale Current text node scale
+-- @tfield vector3 start_size Initial text node size
+-- @tfield vector3 text_area Current text node available are
+-- @tfield bool is_no_adjust Current text size adjust settings
+-- @tfield vector3 color Current text color
+
 local Event = require("druid.event")
 local const = require("druid.const")
 local component = require("druid.component")
@@ -19,33 +37,6 @@ local function update_text_size(self)
 end
 
 
-function M.init(self, node, value, no_adjust)
-	self.node = self:get_node(node)
-	self.start_pivot = gui.get_pivot(self.node)
-
-	self.start_pos = gui.get_position(self.node)
-	self.pos = gui.get_position(self.node)
-
-	self.start_scale = gui.get_scale(self.node)
-	self.scale = gui.get_scale(self.node)
-
-	self.start_size = gui.get_size(self.node)
-	self.text_area = gui.get_size(self.node)
-	self.text_area.x = self.text_area.x * self.start_scale.x
-	self.text_area.y = self.text_area.y * self.start_scale.y
-
-	self.is_no_adjust = no_adjust
-	self.last_color = gui.get_color(self.node)
-
-	self.on_set_text = Event()
-	self.on_update_text_scale = Event()
-	self.on_set_pivot = Event()
-
-	self:set_to(value or 0)
-	return self
-end
-
-
 --- Setup scale x, but can only be smaller, than start text scale
 local function update_text_area_size(self)
 	gui.set_scale(self.node, self.start_scale)
@@ -73,9 +64,37 @@ local function update_text_area_size(self)
 end
 
 
+--- Component init function
+-- @function text:init
+-- @tparam node node Gui text node
+-- @tparam[opt] string value Initial text
+-- @tparam[opt] bool no_adjust If true, text will be not auto-adjust size
+function M.init(self, node, value, no_adjust)
+	self.node = self:get_node(node)
+	self.pos = gui.get_position(self.node)
+
+	self.start_scale = gui.get_scale(self.node)
+	self.scale = gui.get_scale(self.node)
+
+	self.start_size = gui.get_size(self.node)
+	self.text_area = gui.get_size(self.node)
+	self.text_area.x = self.text_area.x * self.start_scale.x
+	self.text_area.y = self.text_area.y * self.start_scale.y
+
+	self.is_no_adjust = no_adjust
+	self.color = gui.get_color(self.node)
+
+	self.on_set_text = Event()
+	self.on_update_text_scale = Event()
+	self.on_set_pivot = Event()
+
+	self:set_to(value or 0)
+	return self
+end
+
+
 --- Set text to text field
 -- @function text:set_to
--- @tparam table self Component instance
 -- @tparam string set_to Text for node
 function M.set_to(self, set_to)
 	self.last_value = set_to
@@ -91,28 +110,25 @@ end
 
 --- Set color
 -- @function text:set_color
--- @tparam table self Component instance
--- @tparam vmath.vector4 color Color for node
+-- @tparam vector4 color Color for node
 function M.set_color(self, color)
-	self.last_color = color
+	self.color = color
 	gui.set_color(self.node, color)
 end
 
 
 --- Set alpha
 -- @function text:set_alpha
--- @tparam table self Component instance
 -- @tparam number alpha Alpha for node
 function M.set_alpha(self, alpha)
-	self.last_color.w = alpha
-	gui.set_color(self.node, self.last_color)
+	self.color.w = alpha
+	gui.set_color(self.node, self.color)
 end
 
 
 --- Set scale
 -- @function text:set_scale
--- @tparam table self Component instance
--- @tparam vmath.vector3 scale Scale for node
+-- @tparam vector3 scale Scale for node
 function M.set_scale(self, scale)
 	self.last_scale = scale
 	gui.set_scale(self.node, scale)
@@ -122,7 +138,6 @@ end
 --- Set text pivot. Text will re-anchor inside
 -- his text area
 -- @function text:set_pivot
--- @tparam table self Component instance
 -- @tparam gui.pivot pivot Gui pivot constant
 function M.set_pivot(self, pivot)
 	local prev_pivot = gui.get_pivot(self.node)
diff --git a/druid/base/timer.lua b/druid/base/timer.lua
index 8fecf86..712dc93 100644
--- a/druid/base/timer.lua
+++ b/druid/base/timer.lua
@@ -1,6 +1,24 @@
---- Component to handle GUI timers
+--- Component to handle GUI timers.
+-- Timer updating by game delta time. If game is not focused -
+-- timer will be not updated.
 -- @module druid.timer
 
+--- Component events
+-- @table Events
+-- @tfield druid_event on_tick On timer tick callback. Fire every second
+-- @tfield druid_event on_set_enabled On timer change enabled state callback
+-- @tfield druid_event on_timer_end On timer end callback
+
+--- Component fields
+-- @table Fields
+-- @tfield node node Trigger node
+-- @tfield[opt=node] node anim_node Animation node
+-- @tfield vector3 scale_from Initial scale of anim_node
+-- @tfield vector3 pos Initial pos of anim_node
+-- @tfield any params Params to click callbacks
+-- @tfield druid.hover hover Druid hover logic component
+-- @tfield[opt] node click_zone Restriction zone
+
 local Event = require("druid.event")
 local const = require("druid.const")
 local formats = require("druid.helper.formats")
@@ -10,6 +28,12 @@ local component = require("druid.component")
 local M = component.create("timer", { const.ON_UPDATE })
 
 
+--- Component init function
+-- @function timer:init
+-- @tparam node node Gui text node
+-- @tparam number seconds_from Start timer value in seconds
+-- @tparam[opt=0] number seconds_to End timer value in seconds
+-- @tparam[opt] function callback Function on timer end
 function M.init(self, node, seconds_from, seconds_to, callback)
 	self.node = self:get_node(node)
 	seconds_from = math.max(seconds_from, 0)
@@ -31,42 +55,6 @@ function M.init(self, node, seconds_from, seconds_to, callback)
 end
 
 
---- Set text to text field
--- @function timer:set_to
--- @tparam table self Component instance
--- @tparam number set_to Value in seconds
-function M.set_to(self, set_to)
-	self.last_value = set_to
-	gui.set_text(self.node, formats.second_string_min(set_to))
-end
-
-
---- Called when update
--- @function timer:set_state
--- @tparam table self Component instance
--- @tparam boolean is_on Timer enable state
-function M.set_state(self, is_on)
-	self.is_on = is_on
-
-	self.on_set_enabled:trigger(self:get_context(), is_on)
-end
-
-
---- Set time interval
--- @function timer:set_interval
--- @tparam table self Component instance
--- @tparam number from Start time in seconds
--- @tparam number to Target time in seconds
-function M.set_interval(self, from, to)
-	self.from = from
-	self.value = from
-	self.temp = 0
-	self.target = to
-	M.set_state(self, true)
-	M.set_to(self, from)
-end
-
-
 function M.update(self, dt)
 	if not self.is_on then
 		return
@@ -89,5 +77,37 @@ function M.update(self, dt)
 	end
 end
 
+--- Set text to text field
+-- @function timer:set_to
+-- @tparam number set_to Value in seconds
+function M.set_to(self, set_to)
+	self.last_value = set_to
+	gui.set_text(self.node, formats.second_string_min(set_to))
+end
+
+
+--- Called when update
+-- @function timer:set_state
+-- @tparam bool is_on Timer enable state
+function M.set_state(self, is_on)
+	self.is_on = is_on
+
+	self.on_set_enabled:trigger(self:get_context(), is_on)
+end
+
+
+--- Set time interval
+-- @function timer:set_interval
+-- @tparam number from Start time in seconds
+-- @tparam number to Target time in seconds
+function M.set_interval(self, from, to)
+	self.from = from
+	self.value = from
+	self.temp = 0
+	self.target = to
+	M.set_state(self, true)
+	M.set_to(self, from)
+end
+
 
 return M
\ No newline at end of file
diff --git a/druid/event.lua b/druid/event.lua
index 1d6c289..b4bc110 100644
--- a/druid/event.lua
+++ b/druid/event.lua
@@ -45,7 +45,7 @@ end
 
 --- Return true, if event have at lease one handler
 -- @function event:is_exist
--- @treturn boolean True if event have handlers
+-- @treturn bool True if event have handlers
 function M.is_exist(self)
 	return #self._callbacks > 0
 end
diff --git a/example/kenney/page/main.lua b/example/kenney/page/main.lua
index 70e5539..834593c 100644
--- a/example/kenney/page/main.lua
+++ b/example/kenney/page/main.lua
@@ -19,8 +19,8 @@ end
 local function setup_button(self)
 	local b = self.druid:new_button("button_simple", lang.toggle_locale, "button_param")
 	self.druid:new_button("button_template/button", function()
-		print(b:get_enabled())
-		b:set_enabled(not b:get_enabled())
+		print(b:is_enabled())
+		b:set_enabled(not b:is_enabled())
 	end, "button_param")
 end
 
diff --git a/example/kenney/page/scroll.lua b/example/kenney/page/scroll.lua
index 71fe04d..4fb112c 100644
--- a/example/kenney/page/scroll.lua
+++ b/example/kenney/page/scroll.lua
@@ -4,6 +4,7 @@ local M = {}
 local function init_grid(self)
 	local prefab = gui.get_node("grid_prefab")
 
+	local grid_scroll = self.druid:new_scroll("grid_content", "scroll_with_grid_size")
 	local grid = self.druid:new_grid("grid_content", "grid_prefab", 20)
 	grid:set_anchor(vmath.vector3(0, 0.5, 0))
 
@@ -13,12 +14,15 @@ local function init_grid(self)
 		grid:add(clone_prefab["grid_prefab"])
 		gui.set_text(clone_prefab["grid_prefab_text"], "Node " .. i)
 
-		self.druid:new_button(clone_prefab["grid_button"])
+		self.druid:new_button(clone_prefab["grid_button"], function()
+			local position = gui.get_position(clone_prefab["grid_prefab"])
+			position.x = -position.x
+			grid_scroll:scroll_to(position)
+		end)
 	end
 
 	gui.set_enabled(prefab, false)
 
-	local grid_scroll = self.druid:new_scroll("grid_content", "scroll_with_grid_size")
 	grid_scroll:set_border(grid:get_size())
 
 	local scroll_slider = self.druid:new_slider("grid_scroll_pin", vmath.vector3(300, 0, 0), function(_, value)