i use myfaces with rich:tabpanel, it works. i just have problem with ui:include in ajajx mode.
I said that MyFaces supports JSF 1.1 and does not pass certification about compliance with JSF 1.2 Spec.
This statement does not mean somehow that Richfaces supports only 1.2
Ajax4jsf and Richfaces are designed to support both JSF 1.1 and JSF 1.2.