Hi Austin Winner,
Since RadDock is a relatively new control we did not manage to prepare articles how to apply custom theme to the control. We apologize for the inconvenience.
In order to apply your custom RadTabStrip theme to the RadDock control you should modify a little bit you theme. However, sending you a step by step tutorial how to achieve this modification will not be convenient for you. For that reason we would like to ask you to send you us your theme. Thus we will be able to modify it and provide a sample project that applies it to RadDock control.
Please, note that in order to attach a file you need to open a New Support Ticket (Your Account -> Your Support Tickets -> New Support Ticket.) Support Tickets also guarantee your privacy. We are looking forward to your reply.
the Telerik team