Since the mouse wheel does work on our demo, most probably there is a problem in your application. I would like to request a simple application that could be used to observe the problem and we will try to provide a solution as soon as possible.
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? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items.