Hello,

to a XamDataGrid I bind a collection of simple objects.
The collection is based on  ObservableCollection<T> and additional implements IBindingList
so it supports CurrentItem, object addings and removings.

I need the features of the ObservableCollection.
The IBindingList I've only implemented, because without it the grid was not able to do AddNew rows at all. 

This works well until I add the IsSynchronizedWithCurrentItem="True" option to the grid.
As soon I add a new record but cancel it with Escape, an exception is thrown by the collection:
Remove is not allowed while an AddNew or EditItem transaction (free translated from german).

I managed to circumvent this issue by catching the grids RecordUpdateCanceling
and call the CommitNew() method of the collections IEditableCollectionView within the event handler.
But I think of this as an ugly hack. Not only that calling CancelNew() isn't enough, I think it should be not needed at all to work proper.

To make life easier I added an working (exception throwing) sample.
You find further issue related comments within MainWindow.xaml.cs

A great thank you in advance!