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Custom Component Focus Ring

Mike Swingler wrote:

Perhaps we should add one. :)
Using the focusable attribute might be a good hint too. I'm taking all
suggestions at this point.

While on the topic of focus rings, when creating a custom focusable component (e.g. by specializing JPanel), what is the best way to add a focus ring? Should I paint it myself in my component, create my own border class to paint it, or use an Aqua PLAF class? If I paint it myself, what colour should I use -- I can't find a UIDefaults value for the focus ring colour, nor is there a java.awt.SystemColor entry for it. And what is the best technique to get the "glow" effect -- draw multiple outlines (e.g. rect or round rect) with increasing size and transparency? Is there some funky trick in Java2D to get the right gradient with a single outline?

The last custom component I wrote I wound up refactoring to inherit from a component that already had a focus ring. That may not always be possible, or the best solution.
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