You can do this by editing the ControlTemplate in Expression Blend.
I'm also attaching the TabControl's style, so you will be able to change it in Visual Studio also.
Kind regards,
Miro Miroslavov
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