Thanks for writing.
We have had similar issue in VirtualizingDataCollection
which we have already addressed in Q2 2011 SP1. Since we are currently not able to reproduce it with our latest assemblies, we would kindly like to ask you to provide us with some further details like the version of the controls you are using or possibly to prepare a sample Windows Phone 7 application that reproduces the scenario and send it to us in a new support ticket. In this way we will be able to directly take a look at the case and see what goes wrong.
Thanks for your time.
the Telerik team
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