Thanks alot. I took option to override the style as described in that issue. Now works, although I'll now need to deal with side effects of overflow: visible; in the table. I've voted for
https://issues.jboss.org/browse/RF-11842, I think this will completely solve the problem.
Actually, I found the workaround described in https://issues.jboss.org/browse/RF-12592 ended up not solving my problem. Applying overflow:visible to
richfaces style .rf-edt-c meant every column will overflow and creates unreadable tables. This also does not solve the problem of clipped menus in small tables where the the menu needs to display past the bottom of the table (either the menu is clipped or it creates a flashing effect where rows move in order to display the drop down menu. After much trial and error I discovered this simple richfaces override completely solves the problem (well no side effects witnessed yet....):