I apologize for the late response.
It seems that your problem might be specific to your case. Could you set up and send us a small project that has this problem. It doesn't need to be full project, just the minimum one -- a page or two with all the related stylesheets, scripts, images and other resources.
Also, remember NOT to include the Telerik DLL's in the project.
With that information provided, we'll be able to quickly come up with a solution.
the Telerik team