#include <GUIConstantsEx.au3>
HotKeySet("{ESC}", "StateWindow")
Local $hGUI = GUICreate("", 500, 500)
GUICtrlCreateLabel("Смена состояния по клавише ESCAPE", 10, 30)

GUISetState(@SW_SHOW, $hGUI)
Local $state = 1
While 1
Switch GUIGetMsg()
Case $GUI_EVENT_CLOSE
Exit
EndSwitch
WEnd

Func StateWindow()
if $state = 1 Then 
GUISetState(@SW_HIDE, $hGUI)
$state = 2
Else
$state = 1
GUISetState(@SW_SHOW, $hGUI)
EndIf
EndFunc