In RadGridView documentation (Loading Data from RIA Services) NorthwindDataSource class created with public property Customers, wich is of ObservableCollection type. Why do we need to do extra class with property, if in DomainDataContext all loaded entities are IEnumerable with INotifyCollectionChanged implementation (according to RIA Services documentation)?
I have tried to bind directly to LoadOperation.Entities. All works fine except RadGridView.BeginInsert() - new line does not appear (by the way DataForm works the same way). Does it mean that Ria Services doсs have mistake (look at LoadOperation.Entities property xml comments), or some bug in RadGridView control?