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Global Toggle=0

Procedure MyWindowCallback(WindowID, Message, wParam, lParam)
  Result = #PB_ProcessPureBasicEvents
  If Message = #WM_MOVE And IsWindow(1)
    GetWindowRect_(WindowID, @Rect.RECT)
    ResizeWindow(1, Rect\right, Rect\top, #PB_Ignore, #PB_Ignore)
  EndIf
  ProcedureReturn Result
EndProcedure

OpenWindow(0, 0, 0, 400, 300, "Left window", #PB_Window_ScreenCentered | #PB_Window_SystemMenu)

ButtonGadget(2, 150, 100, 100, 100, "Show child window")

Procedure ShowIt()
  GetWindowRect_(WindowID(0), @Rect.RECT)
  OpenWindow(1, Rect\right, Rect\top, 300, 200, "Right window", #PB_Window_SystemMenu | #PB_Window_TitleBar,WindowID(0))
  SetWindowCallback(@MyWindowCallback(), 0)
  hMenu = GetSystemMenu_(WindowID(1), 0)
  RemoveMenu_(hMenu, #SC_MOVE, #MF_BYCOMMAND )
  toggle=1
EndProcedure

Procedure CloseIt()
  CloseWindow(1)
  toggle=0
EndProcedure



Repeat
  windowevent=WaitWindowEvent()
  Gadget=EventGadget()
  window=EventWindow()
  EventType = EventType() 
  If Gadget = 2 And EventType = #PB_EventType_LeftClick
    If toggle=0
      ShowIt()
    Else
      CloseIt()
    EndIf
  EndIf
  If window=0 And Windowevent=#PB_Event_CloseWindow
    Break
  ElseIf window=1 And Windowevent=#PB_Event_CloseWindow
    CloseIt()
  EndIf
  
ForEver

End