Well, I didn’t find what I was looking for, but I did find this fantastic tab pane instead, at WebFX. I’d seen the site mentioned recently on the CFAussie mailing list in conjunction with Bindows, which is a DHTML GUI toolkit. Nice.
Anyway, using the tab panel (which involved nothing more than including the js and css files, and placing my CF code into particularly named divs) allowed a much simpler and more organised interface, so I threw away the rolled up panels idea and switched to tabs. It looks very impressive. I think it will be easier to use too.