I have posted the code for a mockup (actually about 80% there) for a
replacement for Sun's JColorChooser.  All the widgets generate
propagating events.

I originally intended this merely as a student project, but I ended up
writing a lot more code that I originally planned to describe the
behaviours I wanted.

It is rather fun to play with since all the controls are
interconnected to stay in sync.

see http://mindprod.com/project/jcolourchooser.html

I will probably complete it myself in a few weeks after I get some
higher priority work out the way.