Thank you for contacting Telerik Support.
We are using two different versions, because we have not had the time to upgrade the jQuery used within Sitefinity. The RadControls for ASP.NET Ajax use the latest version of jQuery, however they move this to another call handler, so that it does not conflict with other versions of jQuery. Unfortunately we do not this with the Sitefinity jQuery used. So try using the 1.3.2 version of the library.
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items.