Run one of the signed applets or java web start applications with JRE 1.6.0 in GTK l&f. When you see security dialog, try clicking on "More Information..." - it is a JButton.
Press down mouse key - you'll see that background color changes to darker, and border gets painted. If I drag pressed mouse away from the JButton, and then release mouse button, background of JButton is painted to a lighter gray color then original background color was. "More information" button has setBorderPainted(false), empty border of 5 pixels and setContentAreaFilled(false) properties set. In metal l&f the button has no border and background does not change when button is pressed.
Attached are two screenshots with described problem.
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