diff --git a/druid/base/checkbox_group.lua b/druid/base/checkbox_group.lua
index 459527e..92a18a6 100644
--- a/druid/base/checkbox_group.lua
+++ b/druid/base/checkbox_group.lua
@@ -12,8 +12,8 @@ end
 
 function M.set_state(self, indexes)
 	for i = 1, #indexes do
-		if self.checkbox[indexes[i]] then
-			self.checkbox[indexes[i]]:set_state(true, true)
+		if self.checkboxes[i] then
+			self.checkboxes[i]:set_state(indexes[i], true)
 		end
 	end
 end
diff --git a/druid/base/slider.lua b/druid/base/slider.lua
index 0caa56f..ff2881f 100644
--- a/druid/base/slider.lua
+++ b/druid/base/slider.lua
@@ -76,6 +76,17 @@ function M.on_input(self, action_id, action)
 	if action.released then
 		self.is_drag = false
 	end
+
+	return self.is_drag
+end
+
+
+function M.set(self, value)
+	value = helper.clamp(value, 0, 1)
+
+	gui.set_position(self.node, self.start_pos + self.dist * value)
+	self.value = value
+	on_change_value(self)
 end
 
 
diff --git a/example/kenney/page/main.lua b/example/kenney/page/main.lua
index 27e2da7..b597021 100644
--- a/example/kenney/page/main.lua
+++ b/example/kenney/page/main.lua
@@ -63,22 +63,27 @@ end
 
 
 local function setup_slider(self)
-	self.druid:new_slider("slider_pin", vmath.vector3(95, 0, 0), function(_, value)
+	local slider = self.druid:new_slider("slider_pin", vmath.vector3(95, 0, 0), function(_, value)
 		gui.set_text(gui.get_node("text_progress_slider"), math.ceil(value * 100) .. "%")
 	end)
+
+	slider:set(0.2)
 end
 
 
 local function setup_checkbox(self)
-	self.druid:new_checkbox_group(
-		{"radio1/check", "radio2/check", "radio3/check" },
+	local group1 = self.druid:new_checkbox_group(
+		{"radio1/check", "radio2/check", "radio3/check"},
 		nil, true,
 		{"radio1/back", "radio2/back", "radio3/back"})
 
-	self.druid:new_checkbox_group(
-		{"checkbox1/check", "checkbox2/check", "checkbox3/check" },
+	local group2 = self.druid:new_checkbox_group(
+		{"checkbox1/check", "checkbox2/check", "checkbox3/check"},
 		nil, false,
 		{"checkbox1/back", "checkbox2/back", "checkbox3/back"})
+
+	group1:set_state({false, false, true})
+	group2:set_state({true, false, true})
 end