unfortunately, Remus beat me to it, so he gets the points
I wonder if the locking that happens on Firefox is part of the problem - or separate
answered on 08 May 2012, 08:03 AM
The two issues are way different, the forum you linked is about problem in server side of the control, that happens after postback with invalid value. I think it is already fixed and it should work correctly in the current official version.
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 now.