anchor.diff:  
   <ui:formGuide simulateEvents="true">
   	<ui:depends elementIds="${component}_familyStatus"/>
  -    <ui:observe elementIds="${component}_twinZygosity" forValue="1|2|3" negate="true"/>
  +    <ui:observe elementIds="${component}_twin" forValue="1" negate="true"/>
  +	<ui:disable elementIds="${component}_twinZygosity"/>
  +	<ui:setValue elementIds="${component}_twinZygosity" value=""/>
   	<ui:disable elementIds="${component}_twinId"/>
   	<ui:setValue elementIds="${component}_twinId" value=""/>
   </ui:formGuide>
  
positive.code: <c:if test="${componentMode != 'vw'}">
  <ui:formGuide ignoreUndo="true" ignoreUndoOnLoad="true">
      <ui:observe elementIds="${component}_familyStatus" forValue="Individual|^$"/>
  	<ui:disable elementIds="${component}_familyStudy"/>
  	<ui:disable elementIds="${component}_relationToProband"/>
  	<ui:disable elementIds="${component}_familyId"/>
  	<ui:disable elementIds="${component}_probandCandidate"/>
  	<ui:disable elementIds="${component}_twinZygosity"/>
  	<ui:disable elementIds="${component}_projSiteId"/>
  	<ui:disable elementIds="${component}_relationNotes"/>
  	<ui:setValue elementIds="${component}_familyStudy" value=""/>
      <ui:setValue elementIds="${component}_relationToProband" value=""/>
  	<ui:setValue elementIds="${component}_probandCandidate" value=""/>
  	<ui:setValue elementIds="${component}_twinZygosity" value=""/>
  	<ui:setValue elementIds="${component}_projSiteId" value=""/>
      <ui:setValue elementIds="${component}_relationNotes" value=""/>
      <ui:setValue elementIds="${component}_familyId" value=""/>
  
negative.code: 
  <ui:formGuide ignoreUndo="true" ignoreUndoOnLoad="true">
      <ui:observe elementIds="${component}_familyStatus" forValue="Family$"/>
      <ui:enable elementIds="${component}_relationToProband"/>
  	<ui:enable elementIds="${component}_probandCandidate"/>
  	<ui:enable elementIds="${component}_twin"/>
  	<ui:enable elementIds="${component}_projSiteId"/>
      <ui:enable elementIds="${component}_relationNotes"/>  
      <ui:setValue elementIds="${component}_familyStudy" value=""/>
  </ui:formGuide>
  
  <ui:formGuide>
  