I wasn't able to reproduce this issue. In order to provide you with an appropriate solution, could you please send us a small runnable project isolating the problem, so we could investigate this behavior.
Thank you in advance.
All the best,
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed