EnableExplicit

Define EventID

If OpenWindow(0,0,0,500,400,"Window",#PB_Window_SystemMenu|#PB_Window_ScreenCentered)
  Frame3DGadget(1,10,10,WindowWidth(0)-20,WindowHeight(0)-20,"Titel",0)
  
  SetWindowLongPtr_(GadgetID(1),#GWL_STYLE,GetWindowLongPtr_(GadgetID(1),#GWL_STYLE) | #BS_CENTER)
  
  Repeat
    EventID=WaitWindowEvent()
    If EventID = #PB_Event_CloseWindow
      End
    EndIf
  ForEver
EndIf