Currently there is no easy way to implement this functionality. We are planning to add support for a DropDown (VisualStudio - like) and scrolling items for the Q1 release.
Unfortunately I cannot give you any details with certainty.
Thank you for your feedback, it is very important to know how the controls are used, so we can adjust our plans accordingly.
How many items at most do you think that will be added to the TabControl? Do you add large number of items to other controls?
All the best,
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.