Introduce an expression builder for specifying filtering the grid by custom rules. Similar to the RadGrid for Silverlight: http://demos.telerik.com/silverlight/#ExpressionEditor/FilteringGridView
This is a feature that you should strongly consider adding in the future. Your competitor, DevExpress supports this. Its an absolutely wonderful feature that our customers use every day. So you could easily have the grid do this: (QuantityAllocated > QuantityOnHand AND AverageCost > 0) OR TopSeller = True
This is exactly what I need for my grid... Ive been asking for a way to filter based on the data in the grid, using dropdowns, byt the checkboxes is equally great.... PLEASE Add.