Few more ideas

[mgrouch]

Please, take a look at these threads. Might be this functionality
could be done (or belongs) to RichFaces as opposed to Seam

http://www.jboss.com/index.html?module=bb&op=viewtopic&t=116549

http://www.jboss.com/index.html?module=bb&op=viewtopic&t=116230&start=10

http://www.jboss.com/index.html?module=bb&op=viewtopic&t=116149

http://www.jboss.com/index.html?module=bb&op=viewtopic&t=114328

http://andrewfacelets.blogspot.com/2006/06/creating-composite-controls-with-jsf.html

Thanks