Simon Goodchild wrote

I'm going to be doing something like that for a project I'm about to
start, so should have something to contribute back in a month or so. I
was originally planing to handle the 'tabbing' with css, based on the
section elements already there, but maybe a dedicated tab control is a
better solution. Is there some documentation on creating new controls,
or can I get some pointers on the best way to do this?