There seems to be some kind of misunderstanding here -- could you elaborate a bit more whether you are trying to use RadChart for Silverlight or RadChart for ASP.NET AJAX as you have filed your inquiry in the Silverlight forum but the provided markup is applicable only for the ASP.NET AJAX version of the control.
Looking forward to your reply.
All the best,
the Telerik team
Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>