XPages Extension Library
A replacement for the tabbedPanel, the one as default component has some Big problems with many tabs, specialy if on more than one row.
Dojo solves it more elegantly.
Look at the dynamic tabs sample page. It uses an encapsulation of the Dojo tab dijits, with some special integration features for XPages.
Doesn't that fit your requirement?
I'm using already using dijit tabs to show differents xpages on differents tabs. The xpages tabbedpannel, let you span a single xpage/document on more tabs. I was thinking about this function. More like an inpruved version.