Hi Darren,
Thank you for your feedback. The samples on the site show the old version of the Summer theme. However, the current design of the theme is quite different and we will update our help articles accordingly.
However, please find attached example with a custom theme of the RadTabControl implementing your scenario.
If you have further questions please do not hesitate to ask us.
I hope this will help you.
All the best,
Dimitrina
the Telerik team
Browse the
videos here>> to help you get started with RadControls for Silverlight