The Telerik blog posting at http://blogs.telerik.com/xamlteam/posts/12-12-21/introducing-radpivotgrid-for-wpf-silverlight describes how to add "calculation" fields to a RadPivotGrid for WPF/Silverlight. As far as I can tell, the current version of RadPivotGrid for ASP.NET AJAX doesn't have this feature. Please add this feature to the RadPivotGrid for ASP.NET AJAX. I need it in order to add percentages to a RadPivotGrid similar to what is described in the Calculations section in the blog entry.