Creating components in XP L&F throws OutOfMemoryError.

Creating a large number of JInternalFrames in SwingSet2 is causing the application to throw an OutOfMemoryError. This happens when running the scenario on a XP L&F. To reproduce, do the following:

- Create about 200+ internal frames while switching between JLF and the
  Windows L&F (XP L&F since I was testing on an XP system). I noticed that
  as the number of internal frames grew, the XP L&F became slower everytime
  you requested SwingSet2 to create a new internal frame. When I switch to
  JLF, though, I was able to click away full speed creating new internal
  frames. However, when I switched back to XP L&F, it took time for it to
  repaint, and when I monitored the memory usage in task manager, I can see
  the memory usage grow slowly. On my machine, at about 80K to 85K, the
  system finally threw an OutOfMemoryError when I switched from JLF to
  XP L&F.

The problem was produced on the latest Mantis build, b18.

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