Flickering and Gray Box When Closing Dialog

I have a JPanel on which I paint a lot of stuff. When I close a JDialog that had appeared on top of a portion of the JPanel, I sometimes get flickering and gray box ugliness for a split second.
Of course, the paintComponent method that I have for the JPanel is getting executed. It doesn't seem to be much of a problem most of the time when I run JRE 1.3 for Windows on one of the computers I use. Then I use the application on a higher-performance computer with JRE 1.3 for Windows going, and the flickering gray box nonsense always seems to occur.
Does anybody have possible suggestions on how to improve this situation?

you could try to set it invisible before closing it.

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Revision: 17872
Revision: 17872
Author:   [email protected]
Date:     2010-09-27 08:04:40 -0700 (Mon, 27 Sep 2010)
Log Message:
Popup: Exposed set accessor of open for view state usage and fixed bug when closing from model within popup. http://www.spicefactory.org/forum/viewtopic.php?p=3932. Added new sample to show model and view state interactions.
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