This was fixed in previous releases, you can check Q3 2011, however it seems that we have introduced the bug again. In Q1 2012 we changed the implementation of the Popup used in the template of the control and it seems that this change has introduced the problem.
I have logged it in our PITS where you can follow the item's progress
Please, excuse us for the inconvenience. We have added points to your account for the report. Don't hesitate to contact us if you have other questions.
the Telerik team
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