#include <GUIConstantsEx.au3>
#include <WindowsConstants.au3>


Opt("GUIOnEventMode", 1)
$Form1 = GUICreate("Form1", 623, 449, 192, 114)
GUISetOnEvent(-3,"_Exit")
$btn = GUICtrlCreateButton("Test",0,0,50,50)
GUICtrlSetOnEvent(-1,"_Btn")
GUISetState(@SW_SHOW)


While Sleep(100)
WEnd

Func _Exit()
    Exit
EndFunc   ;==>_Exit

Func _Btn()
if @GUI_CtrlId = $btn Then MsgBox(0,"","")
EndFunc   ;==>_Btn