+ // return true if this is the starting item of a radio group
+ bool IsRadioGroupStart() const;
+
+ // get the start of the radio group this item belongs to: should not be
+ // called for the starting radio group item itself because it doesn't have
+ // this information
+ int GetRadioGroupStart() const;
+
+ // get the end of the radio group this item belongs to: should be only
+ // called for the starting radio group item, i.e. if IsRadioGroupStart() is
+ // true
+ int GetRadioGroupEnd() const;
+