Kevin,

So with that, what purpose does the binding properties on the mmradio control serve?

>Windows Forms Radio buttons are odd animals...you would expect the behavior you mentioned above, but that's not how they work. They are more a "loose confederation" of individual controls rather than acting as a single control. You can't data drive the selection, because there is not a single value that represents the selection. Each radio button in a group has its own Checked property which is either true or false.