When you create two group descriptions, there's no way to use them on a single row - they are always getting compared. You can use a single group description and add a property in your data item to return the combined value of FirstName and LastName. You can extend this solution by using DataAnnotations to hide FirstName and LastName from RadPivotFieldList as shown in this help topic
Hope this helps. Feel free to contact us in case you have any other problems or concerns.
TRY TELERIK'S NEWEST PRODUCT - EQATEC APPLICATION ANALYTICS for SILVERLIGHT.
Learn what features your users use (or don't use) in your application. Know your audience. Target it better. Develop wisely.
Sign up for Free application insights >>