Hello, after upgrading to the latest SR i get the following exception on the load data of a virtual collection binded to XamDataTree

   at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
   at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
   at System.Collections.Generic.Dictionary`2.ContainsKey(TKey key)
   at Infragistics.Controls.Menus.NodesManager.DataManager_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at Infragistics.DataManagerBase.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Infragistics.DataManager`1.OnDataSourceCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Infragistics.DataManagerBase.DataSource_CollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at Infragistics.Collections.VirtualCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Infragistics.Collections.VirtualCollection`1.RaiseCollectionChanged(NotifyCollectionChangedEventArgs args)
   at Infragistics.Collections.VirtualCollection`1.NotifyItemChanged(T oldItem, Int32 collectionIndex)
   at Infragistics.Collections.VirtualCollection`1.LoadItems(Int32 index, IEnumerable`1 items)
   at BSNet.Andromeda.Base.ViewModels.ProductsViewModel.client_GetStockExchangeProductKindsCompleted(Object sender, GetStockExchangeProductKindsCompletedEventArgs e)
   at BSNet.Andromeda.StaticDataServiceReference.StaticDataServiceClient.OnGetStockExchangeProductKindsCompleted(Object state)