Java version: 1.6.0-ea-b09
Platforms: solaris and linux with GTK L&F
Problems:
In SwingSet2 demo, when the top menu button clicked, if your mouse move over above the button which is focused, the image is gone, the button is black, but if your mouse move off the button, the image is back.

You also can see it in JFileChooser demo, when you click JFileChooser demo, and clicked Show JFileChooser button, when your mouse move over the OK button or cancel button, any buttons, if there is an image, the image will be gone, until your mouse move off.

To reproduce:
1. Launch swingset2 deom in b09;
2. choose GTK L&F;
3. click any top buttons, then hold the mouse or move the mouse over the button, you will see the button is black;
4. b08 is ok, and other look and feel are ok(java/motif)
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