When the popup menu is wider than the window frame, select the menu item and tried to scroll through the options, the popupmenu hide in back of window frame and only scroll bar is visible. Please see the attachment for snapshot.

The work around is to expand the window frame to be wider than the popup menu frame.

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Test case JOptionPaneTest.java is attached, just compile ane run to reproduce the problem.
minchi.tien@eng 2001-07-20
The test has been automated, and the described behavior can no longer be reproduced. Closing the bug...