hiding popupmenu results in its invoker flash

Under Jdk1.4, using popupmenu to do some actions in Sun Management Center makes the console get wholy refreshed, but everything works well if we use the menu in the menubar.

See the reproduce steps:
1. cd /net/hotsauce.eng/guest/sunmc_jdk1.4/bin
2. type "testSMC.sh" to run the "SunMC" application.
3. after the main window comes up, click right mouse under the icon of hotsauce to show the popup menu, after select item "Attribute Editor...", we can see that the console becomes grey for a while before the attribute editor dialog pops up.
4. after we select hotsauce, the Attribute Editor dialog can also be launched via clicking the menuitem Tools -> Attribute Editor..., we can see that the action does not make the main console totally refreshed.

Let me know if you have problems to reproduce this bug.