Thanks for writing and for reporting this issue.
We are currently not aware of any issues in VirtualizingDataCollection
and you are the first to report one. Since based on the stack trace we can only understand where the issue occured, but not how, we would kindly like to ask you to prepare a small Windows Phone 7 app that we can use to reproduce it and send it to us so that we can investigate.
Please note that in order to be able to upload an app, you will have to open a new support ticket.
Thanks for your time.
We look forward to receiving the requested details.
the Telerik team
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