RCDC - UocIdentityPicker - Search Scope combination

Hi

I have this UocIdentityPicker which i'm trying to make a little more user friendly.

            <my:Properties>
                <my:Property my:Name="Required" my:Value="{Binding Source=schema, Path=MailboxAccessAdd.Required}"/>
                <my:Property my:Name="Mode" my:Value="SingleResult" />
<!--                <my:Property my:Name="ObjectTypes" my:Value="Group"/>-->
                <my:Property my:Name="ColumnsToDisplay" my:Value="Email" />
                <my:Property my:Name="AttributesToSearch" my:Value="Email" />
<!--                <my:Property my:Name="UsageKeywords" my:Value="Group"/>-->
                <my:Property my:Name="Value" my:Value="{Binding Source=object, Path=MailboxAccessAdd , Mode=TwoWay}" />
                <my:Property my:Name="Filter" my:Value="/Group[(ObjectID = /Set[ObjectID = 'e2c2876a-a8c2-4727-a728-9ed0bc345ad3']/ComputedMember) and (ObjectID = /Set[ObjectID = 'd775f51e-6b5f-48e7-8040-e9f8e355b49f']/ComputedMember) and (ObjectID != /Person[ObjectID='%ObjectID%']/MailBoxAccess)]"/>
                <my:Property my:Name="ResultObjectType" my:Value="Group"/>
                <my:Property my:Name="ListViewTitle" my:Value="Select only one entry here." />
                <my:Property my:Name="PreviewTitle" my:Value="Entry selected:" />
            </my:Properties>

The above is the XML and it works and it results in this;

What i really want, is to be able to search in the picker box.

If i uncomment;

<my:Property my:Name="ObjectTypes" my:Value="Group"/>

i am then able to search, but then the filter is no longer applied.

Any idea's how to make the filter applied?