子窗口与主窗口分开处理

#include <GUIConstantsEx.au3>

$mainwindow = GUICreate("Hello World", 300, 200)
GUICtrlCreateLabel("Hello world!", 30, 10)
$okbutton = GUICtrlCreateButton("opened the subform", 20, 30, 150)

主窗口点击按钮后又创建了一个新的子窗口，在关闭子窗口时主窗口也关闭了$dummywindow = GUICreate("Dummy window for testing ", 200, 100)

GUISwitch($mainwindow)
GUISetState(@SW_SHOW)

While 1
  $msg = GUIGetMsg(1)

  Select
    Case $msg[0] = $okbutton
      GUISetState(@SW_SHOW,$dummywindow)

    Case $msg[0] = $GUI_EVENT_CLOSE And $msg[1] = $mainwindow 

      Exit
  Case $msg[0] = $GUI_EVENT_CLOSE And $msg[1] = $dummywindow
          GUISetState(@SW_HIDE,$dummywindow)
  EndSelect
WEnd