I wish it was that simple! Reading Qt and KDE sources is my first move to find the limitations of what I can do. Next, I read what some other styles do.

In this case, nobody cares about QToolBox except Qt... and the default style draws all the toolbox tabs the same way unless it's selected. Useless.

I'm gonna ask to the KDE Dev list --if they're not too busy-- then I'll go to the real source of Qt: the Trolls of Trolltech. I've been told they know a little more about Qt than anybody.