Since the IE 10 Beta was available, in March 2012, we've applied many fixes in our way to support IE10. Furthermore, next week we will publish a more recent build which includes fixes for all issues we've found while testing with the latest version of IE10 when we will start officially supporting it.
Therefore I suggest that you download the upcoming release.
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