UI Model for a collection field

I have a form with a collection field which contains three fields

<c:FormField FieldID="MEMBERSHIP" DataType="XML" Caption="Membership">
<c:Collection>
<c:Fields>
<c:FormField FieldID="SITEID" Caption="Fundraiser">
<c:SimpleDataList SimpleDataListID="4c16edc9-d10a-4f71-89a4-875c6b42d3dc" EnableTypeAheadFilter="true" EnableTypeAhead="true" BlankValueCaption="No Selection"/>
</c:FormField>
<c:FormField FieldID="MEMBERSHIPPROGRAMID" Caption="Membership Program">
<c:SimpleDataList SimpleDataListID="f15989b6-f1f5-4dab-beb6-939266cb10bb" EnableTypeAheadFilter="true" EnableTypeAhead="true" BlankValueCaption="No Selection"/>
</c:FormField>
<c:FormField FieldID="MEMBERSHIPLEVELID" Caption="Membership Level">
<c:SimpleDataList SimpleDataListID="85ce5cff-3088-474c-8809-a72f045067d7" EnableTypeAheadFilter="true" EnableTypeAhead="true" BlankValueCaption="No Selection"/>
</c:FormField>
</c:Fields>
</c:Collection>
</c:FormField>
The MEMBERSHIPPROGRAMID list needs to take the SITEID argument from the first dropdown when selected, and the MEMBERSHIPLEVELID listneeds to take the program id from the second dropdown.


I can't figure out how to do this in my UI model


Can anyone point me in the right direction?

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