Hi guys, check it out this: #include <GuiConstants.au3> #include <WindowsConstants.au3> $Main_GUI = GUICreate("Main", 500, 500) GUISetState(@SW_SHOW, $Main_GUI) $Child_GUI = GUICreate("Child", 200, 100, 10, 50) GUISetState(@SW_SHOW, $Child_GUI) DllCall("user32.dll", "int", "SetParent", "hwnd", $Child_GUI, "hwnd", $Main_GUI) While 1 Switch GUIGetMsg() Case $GUI_EVENT_CLOSE Exit EndSwitch WEnd I want to do the exact opposite, i'd like to have the Main_GUI always on focus