         // If this button is in a rb group and it's selected, but it's not the 
         // current selection, deselect the old rb and select this rb.
         if (_group && selected && _group.selection != this)
-            group.mx_internal::setSelection(this, false);        
+            _group.mx_internal::setSelection(this, false);        
     }
     
     //--------------------------------------------------------------------------

        invalidateDisplayList();

        dispatchEvent(new Event("groupNameChanged"));
    }

    //----------------------------------

     *  use group for all of the buttons or groupName for all of the buttons.
     *  In addition, all radio buttons in the group must have the same parent.  
     *
     *  @default "radioGroup"
     *  @see #group
     * 
     *  @throws ArgumentError If the radio button has a different parent than
