RadBradCrumb is a nice idea, but seems to be not really finished.
First, there is no documentation at all.
This little page gives a hint, this thing exists, not more.
Second, the splitbuttons and the dropdownItems are nice initialized and working,
but the DefaultItem of the SplitButton is not set.
You cannot click on the Button, und go up the hierarchie, the most basic function of a breadcrumb.
You always have this dropdown-things only.
Additionally, the RadBradCrumb is quiet a Closed thing, there are no events to subscribe, no virtual methods to override, just nothing.
I have found a workaround for this, which makes it work es expected, but this should be default functionality.