If OpenWindow(0,0,0,500,250,"Window",#PB_Window_SystemMenu|#PB_Window_ScreenCentered)
  ScrollAreaGadget(1,10,10,480,100,240,500,10,0)
  CloseGadgetList()
  ButtonGadget(2,10,120,100,20,"Zurücksetzen",0)
Repeat
EventID=WaitWindowEvent()
If EventID=#PB_Event_Gadget
  Select EventGadget()
   Case 2
     SendMessage_(GadgetID(1),#WM_VSCROLL,#SB_THUMBTRACK,0)
  EndSelect
EndIf
Until EventID = #PB_Event_CloseWindow
EndIf