I've got a DataForm with a QueryableEntityCollectionView as ItemSource.
The QueryableEntityCollectionView is filtered, the DataForm as a custom CommandProvider.
An exception occurs when DataForm.AddNewItem() is beeing hit. "An unhandled exception of type 'System.NullReferenceException' occurred in Telerik.Windows.Data.dll" this is not happening when there is no filter active. Any idea why this is happening and how to have a filter active and add a new item?