diff --git a/druid/base/checkbox_group.lua b/druid/base/checkbox_group.lua
index dd9a94a..85bb211 100644
--- a/druid/base/checkbox_group.lua
+++ b/druid/base/checkbox_group.lua
@@ -39,7 +39,7 @@ end
 
 --- Set checkbox group state
 -- @function checkbox_group:set_state
--- @tparam bool[] state Array of checkbox state
+-- @tparam bool[] indexes Array of checkbox state
 function M.set_state(self, indexes)
 	for i = 1, #indexes do
 		if self.checkboxes[i] then
diff --git a/druid/base/radio_group.lua b/druid/base/radio_group.lua
index a446d02..8701ad0 100644
--- a/druid/base/radio_group.lua
+++ b/druid/base/radio_group.lua
@@ -48,7 +48,7 @@ end
 
 --- Set radio group state
 -- @function radio_group:set_state
--- @tparam bool[] state Array of checkbox state
+-- @tparam number index Index in radio group
 function M.set_state(self, index)
 	on_checkbox_click(self, index)
 end
@@ -56,7 +56,7 @@ end
 
 --- Return radio group state
 -- @function radio_group:get_state
--- @treturn bool[] Array if checkboxes state
+-- @treturn number Index in radio group
 function M.get_state(self)
 	local result = -1
 
diff --git a/druid/base/scroll.lua b/druid/base/scroll.lua
index 4a437c2..56a50aa 100644
--- a/druid/base/scroll.lua
+++ b/druid/base/scroll.lua
@@ -11,7 +11,7 @@
 -- @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
+-- @tfield druid_event on_point_scroll On scroll_to_index function callback
 
 --- Component fields
 -- @table Fields
diff --git a/druid/system/druid_instance.lua b/druid/system/druid_instance.lua
index 4f0ec68..9739803 100644
--- a/druid/system/druid_instance.lua
+++ b/druid/system/druid_instance.lua
@@ -128,12 +128,27 @@ function Druid.create(self, component, ...)
 end
 
 
+--- Call on final function on gui_script. It will call on_remove
+-- on all druid components
+-- @function druid:final
+function Druid.final(self)
+	local components = self.components[const.ALL]
+
+	for i = #components, 1, -1 do
+		if components[i].on_remove then
+			components[i]:on_remove()
+		end
+	end
+end
+
+
 --- Remove component from druid instance.
 -- Component `on_remove` function will be invoked, if exist.
 -- @function druid:remove
 -- @tparam Component component Component instance
 function Druid.remove(self, component)
 	local all_components = self.components[const.ALL]
+
 	for i = #all_components, 1, -1 do
 		if all_components[i] == component then
 			if component.on_remove then
@@ -204,9 +219,11 @@ function Druid.on_message(self, message_id, message, sender)
 			end
 		end
 	else
-		local components = self.components[const.ON_MESSAGE] or const.EMPTY_TABLE
-		for i = 1, #components do
-			components[i]:on_message(message_id, message, sender)
+		local components = self.components[const.ON_MESSAGE]
+		if components then
+			for i = 1, #components do
+				components[i]:on_message(message_id, message, sender)
+			end
 		end
 	end
 end
diff --git a/media/scroll_outline.png b/media/scroll_outline.png
new file mode 100644
index 0000000..888d9f4
Binary files /dev/null and b/media/scroll_outline.png differ
diff --git a/media/scroll_scheme.png b/media/scroll_scheme.png
new file mode 100644
index 0000000..64dbc7e
Binary files /dev/null and b/media/scroll_scheme.png differ