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If OpenWindow(0, 0, 0, 270, 240, #PB_Window_SystemMenu | #PB_Window_ScreenCentered, "Resizable ComboBoxGadget") And CreateGadgetList(WindowID(0)) 
  TextGadget(0, 10, 10, 100, 20, "Items to view")
  StringGadget(1, 120, 10, 50, 20, "8", #PB_String_Numeric) 
  ComboBoxGadget(2, 10, 40, 250, 100); -- Add #CBS_NOINTEGRALHEIGHT flag For WinXP
  ; --> Get 3d border height
  vEdge = GetSystemMetrics_(#SM_CYEDGE)
  ; --> Number of items to view
  itemsToView = Val(GetGadgetText(1))
  ; --> Get height of ComboBox selection field
  cbSelectedItemHeight = SendMessage_(GadgetID(2), #CB_GETITEMHEIGHT, -1, 0)
  ; --> get height of ComboBox item
  cbListItemHeight = SendMessage_(GadgetID(2), #CB_GETITEMHEIGHT, 0, 0)
  ; -- Resize adding 4 units of vEdge (2 for selection field and 2 for dropdown)
  ResizeGadget(2, -1, -1, -1, cbSelectedItemHeight + (cbListItemHeight * itemsToView) + vEdge*4)
  For a = 1 To 29
    AddGadgetItem(2, -1, "ComboBox item " + Str(a))
  Next 
  Repeat 
    event = WaitWindowEvent()
    If event = #PB_EventGadget And EventGadgetID() = 1
      itemsToView = Val(GetGadgetText(1))
      If itemsToView > 0 And itemsToView < CountGadgetItems(2)+1
        ResizeGadget(2, -1, -1, -1, cbSelectedItemHeight + (cbListItemHeight * itemsToView)+ vEdge*4)
      Else
        MessageRequester("Error", "enter a number between 1 and " + Str(CountGadgetItems(2)), 0)
        SetGadgetText(1, "8")
      EndIf
    EndIf
  Until event = #PB_Event_CloseWindow 
EndIf 
End