SwingSet from and running with JDK1.2beta4-J doesn't repaint the tabs after a dialog has covered them on Solaris 2.6 and Windows NT.

Steps to Reproduce:
0) Launch SwingSet with and from JDK1.2beta4-J.
1) Bring up a dialog from the Dialogs menu.
2) Move the dialog so that it covers some of the tabs.
2) Move the dialog away from the tabs.
RESULT: The tabs don't repaint themselves after the dialog has been moved.