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Disabling drop shadow on JWindows?

I just wrote a patch for NetBeans which provides MS-Office style tooltips in lists and trees, if there is not enough space for the entire cell to be displayed - so moving the mouse over any not-fully-displayed items shows a popup that for all intents and purposes looks as if it's extending out the side of the tree or list - it's supposed to look seamless.

As is predictable, I'm using javax.swing.PopupFactory to create the popups. There is just one problem, but it makes the results a bit unattractive on mac-os: Sometimes, if the popup is a heavyweight window, it has a drop shadow (including a small right border dividing it from the rest of the component. It's compounded a bit by the fact that Apple's implementation of PopupFactory doesn't seem to get the algorithm for deciding when to use a heavyweight window quite right - sometimes, apparently randomly, it will use a heavyweight window even though a lightweight popup would work just fine.

I could write a workaround by providing my own PopupFactory implementation, if I knew a way to turn off the drop-shadow for the heavyweight popup window that would sometimes legitimately be needed. Anybody know a way to do it (dirty hacks are acceptable)?

-Tim

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