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

Local $hGUI = GUICreate("Example", 500, 500,0,0,$WS_POPUP)
Local $idButton = GUICtrlCreateButton("Обработчик", 0, 0, 500, 25)
GUISetState(@SW_SHOW, $hGUI)

While 1
Switch GUIGetMsg()
Case $GUI_EVENT_CLOSE
ExitLoop
Case $idButton
func_handler()
EndSwitch
WEnd

Func func_handler()
Local $w = @DesktopWidth
Local $h = @DesktopHeight
WinMove($hGUI, "", 0, 0, $w, $h)

EndFunc