Error in RCDC UocIdentityPicker with FIM 2010 R2

Hi 

I am trying to use the UocIdentityPicker in an RCDC in FIM2010 R2 with thefollowing :

<my:Control my:Name="GroupsToAdd" my:TypeName="UocIdentityPicker" my:Caption="add groups" my:Description="add new groups" my:RightsLevel="{Binding Source=rights, Path=GroupsAddMV}">
 <my:Properties>
  <my:Property my:Name="Required" my:Value="{Binding Source=schema, Path=GroupsAddMV.Required}"/>
  <my:Property my:Name="Mode" my:Value="MultipleResult" />
  <my:Property my:Name="ObjectTypes" my:Value="Group"/>
  <my:Property my:Name="ColumnsToDisplay" my:Value="DisplayName, Description, AccountName" />
  <my:Property my:Name="AttributesToSearch" my:Value="DisplayName, AccountName" />
  <my:Property my:Name="Value" my:Value="{Binding Source=object, Path=GroupsAddMV, Mode=TwoWay}" />
  <my:Property my:Name="Filter" my:Value="/Group[not((ComputedMember='%ObjectID%') or (ExplicitMember='%ObjectID%'))]" />
  <my:Property my:Name="ResultObjectType" my:Value="Group"/>
  <my:Property my:Name="ListViewTitle" my:Value="choose new groups" />
  <my:Property my:Name="PreviewTitle" my:Value="choosen groups" />
 </my:Properties>      
  </my:Control>

The RCDC is taken from a FIM 2010 R1 and works there !

There must be a difference between R1 and R2 or am I overlooking a detail somewhere :-)

When I use it in my RCDC I get this error :

There's an error in the Person display configuration 

Regards

Per