Hello Per,
Do you mean the example from the following url:
http://www.telerik.com/demos/aspnet/prometheus/Chart/Examples/DataBinding/XML/DefaultCS.aspxPlease, make sure you have added the necessary register directives as well as assembly references to
Telerik.Web.UI and
Telerik.Charting in your Prometheus RadChart projects.
Best wishes,
Konstantin Petkov
the Telerik team