OPERATING SYSTEM(S):
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Linux AMD64

FULL JDK VERSION(S):
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java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_02-b05, mixed mode)


STEPS TO REPRODUCE
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- Set the linux display settings to 256 color mode.
- java -jar SwingSet2.jar
- it will render the SwingSet2 UI
- Change the look and feel to "GTK Look and feel", you will not be
  able to see components like JCheckbox, JTree etc. properly.