No, this is currently not supported. The tabstrip appears always on top of its tabs. I will log your request and if more users want that feature we will consider implementing it. I have updated your telerik points.
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