<group serverBehavior="Dynamic Radio.htm" hideFromBuilder="true">
  <groupParticipants selectParticipant="dynamicRadioButtons_attrib">
    <groupParticipant name="dynamicRadioButtons_attrib" /> 
    <groupParticipant name="dynamicRadioButtons_value" partType="multiple" /> 
  </groupParticipants>
</group>
