Hi Michael,
RIA Services will handle this for you out of the box when you submit the changes via a domain context or a DomainDataSource.
Here are some link that you may find useful:
- Mike Taulty's series about Silverlight and RIA Services - Part 1 and Part 2.
- RIA Services examples on MSDN here.
Hope this help,
Stefan Dobrev
the Telerik team
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