ribbon:RadioButton does have a group name ?

Hi Daniel,

I'm sorry but it doesn't have that feature.  That being said, it's designed to support similar functionality but via commands instead.  Many of the Ribbon controls support a CheckableCommandParameter in their CommandParameter and when their Command is handled, you are able to update the control's checked state via that command parameter object.  The "Ribbon / Command Model / Interaction with Checkable Command" topic in the documentation that comes with the product covers this concept.