We're trying to do a simple two-level grouping in a RadGridView:
This has worked great in Q3 2009. Now that we've moved over to Q3 SP2, we're getting an exception when the grid loads:
"Specified method is not supported"
This appears to be associated with a call to a Reset function on a LINQ wrapper to our CollectionView. The CollectionView itself hasn't changed.
Any idea what causes this and how to overcome it?