Indeed, this feature is not present in the standard combo. As we've already mentioned in the other forum post (http://www.telerik.com/community/forums/thread/b311D-matdb.aspx
) it is in our TODO list for our product. Unfortunately, we do not have a specific deadline for it yet however we will implement it either in SP2 or in the next official release Q2 2007.
the Telerik team