Unchecking Multiple Boxes From A Button

[beachteach 0]

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I want to create an interface with a select all button and an unselect all button. The Select All will work fine but the Unselect will not uncheck the boxes.

#region --- GuiBuilder code Start ---
; Script generated by AutoBuilder 0.6 Prototype

#include <GuiConstants.au3>

GuiCreate("MyGUI", 392, 316,-1, -1 , BitOR($WS_OVERLAPPEDWINDOW, $WS_CLIPSIBLINGS))

$Checkbox_1 = GuiCtrlCreateCheckbox("Checkbox1", 30, 30, 130, 20)
$Checkbox_2 = GuiCtrlCreateCheckbox("Checkbox2", 30, 50, 140, 20)
$Checkbox_3 = GuiCtrlCreateCheckbox("Checkbox3", 30, 70, 150, 20)
$Checkbox_4 = GuiCtrlCreateCheckbox("Checkbox4", 30, 90, 160, 20)
$Checkbox_5 = GuiCtrlCreateCheckbox("Checkbox5", 30, 110, 170, 20)
$Button_6 = GuiCtrlCreateButton("Select All", 40, 220, 100, 40)
$Button_7 = GuiCtrlCreateButton("Unselect All", 170, 220, 110, 40)

GuiSetState()
While 1
    $msg = GuiGetMsg()
    Select
    Case $msg = $GUI_EVENT_CLOSE
        ExitLoop
    Case $msg = $Button_6
        $Checkbox_1 = GUICtrlSetState($Checkbox_1,$GUI_CHECKED)
        $Checkbox_2 = GUICtrlSetState($Checkbox_2,$GUI_CHECKED)
    Case $msg = $Button_7
        $Checkbox_1 = GUICtrlSetState($Checkbox_1,$GUI_UNCHECKED)
        $Checkbox_2 = GUICtrlSetState($Checkbox_2,$GUI_UNCHECKED)
    Case Else
    ;;;
    EndSelect
WEnd
Exit
#endregion --- GuiBuilder generated code End ---

Can anyone tell me what I am doing wrong? Thanks

[GaryFrost 15]

#region --- GuiBuilder code Start ---
; Script generated by AutoBuilder 0.6 Prototype

#include <GuiConstants.au3>

GuiCreate("MyGUI", 392, 316,-1, -1 , BitOR($WS_OVERLAPPEDWINDOW, $WS_CLIPSIBLINGS))

$Checkbox_1 = GuiCtrlCreateCheckbox("Checkbox1", 30, 30, 130, 20)
$Checkbox_2 = GuiCtrlCreateCheckbox("Checkbox2", 30, 50, 140, 20)
$Checkbox_3 = GuiCtrlCreateCheckbox("Checkbox3", 30, 70, 150, 20)
$Checkbox_4 = GuiCtrlCreateCheckbox("Checkbox4", 30, 90, 160, 20)
$Checkbox_5 = GuiCtrlCreateCheckbox("Checkbox5", 30, 110, 170, 20)
$Button_6 = GuiCtrlCreateButton("Select All", 40, 220, 100, 40)
$Button_7 = GuiCtrlCreateButton("Unselect All", 170, 220, 110, 40)

GuiSetState()
While 1
    $msg = GuiGetMsg()
    Select
    Case $msg = $GUI_EVENT_CLOSE
        ExitLoop
    Case $msg = $Button_6
        GUICtrlSetState($Checkbox_1,$GUI_CHECKED)
        GUICtrlSetState($Checkbox_2,$GUI_CHECKED)
    Case $msg = $Button_7
        GUICtrlSetState($Checkbox_1,$GUI_UNCHECKED)
        GUICtrlSetState($Checkbox_2,$GUI_UNCHECKED)
    Case Else
   ;;;
    EndSelect
WEnd
Exit
#endregion --- GuiBuilder generated code End ---