I have a frame with a button added to the 'SOUTH' region of the border layout. I am calling GraphicsDevice.setFullScreenWindow() and passing this frame instance. Since Full Screen window is not supported on my platform, it is placing the frame at (0,0) and maximizes it. When I restore back the frame to the window mode (by passing null to the above method) the component that is added to the 'SOUTH' region of the border layout is not shown. It is shown only when I resize the frame explicitly or when I call invalidate(), validate() explicitly right after restoring the frame to the window mode. So the frame must be invalidated automatically when it is restored to Window Mode.

How to reproduce:
I have attached a sample code. compile and run the sample code. You will find a frame with a button 'Do Full Screen'. Click the button. The frame will be maximized and the label of the button will change. Click the same button again and the frame will be restored to the window mode. But you won't find the button in the restored frame. Resize the frame manually and it will be shown.

I tested this with JDK1.4.2 - b19 on Solaris 8 as well as Windows NT.