Gui Button cant be pressed when GUICtrlCreatePic is used

#include <WinApi.au3>           ;need for _WinAPI_SetParent
Local $gui = GUICreate("2 button gui with bk image", 400, 400)
;                       V - here, don't forget it
Local $Pic = GUICtrlCreatePic(@ScriptDir & "\pic.jpg", 0, 0, 400, 400)   ;save the ctrlId
Local $Button1 = GUICtrlCreateButton("Button1", 100, 350, 80, 30)
Local $Button2 = GUICtrlCreateButton("Button2", 220, 350, 80, 30)
_WinAPI_SetParent(GuiCtrlGetHandle($Button1),GuiCtrlGetHandle($Pic))    ;Set the parrent
GUISetState()

While 1
Switch GUIGetMsg()
    Case -3 ;;$GUI_EVENT_CLOSE = -3
        Exit
    Case $Button1
        Exit
    Case $Button2
        Exit
    EndSwitch

WEnd