Thank you for reporting the issue.
We have tested the on-line demos once again and it seems that the issue is cash connected and is caused by the last update. It is removed after an instant refresh of the page with pressing Ctrl+ F5.
Please excuse us for this inconvenience and let us know if you have further questions.
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