Mike:
I've got that much down; thanks.
The problem I'm encountering is that when I tab into the RB group, the On Focus doesn't fire.
Perhaps it ties into the tabless folder. Tabbing out of the last control on the tab is supposed to go to the RB group. It seems, however, to ignore any remaining (non-visible) tabs, returning to the first defined tab (which is an empty page, and that's OK). The focus then lands on the RB group, with the last selected entry highlighted.