Hi Simon Maystre,
Thank you for writing.
The issue that you are describing seems like a known issue of Q1 2010 SP2 (v2010.1.10.504), but not an issue of Q1 2010 SP1 (v2010.1.10.409). Please open a new ticket and send me a sample project which demonstrates your case. This will allow us to investigate your specific scenario and understand whether it is related to the existing issue or not.
I am looking forward to your reply.
the Telerik team
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