Thanks for the feedback.
We are aware of this issue which happens in VS2012. As a temporary workaround I will suggest you to manually change the background colors from VS Tools menu -> Options -> Environment -> Fonts and Colors.
We will do our best to fix it as soon as possible.
Please, do not hesitate to contact us if you have any questions.
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>