When the RowEditEndedEvent event fires I expected the source (itemssource) to be updated. In fact the NewData property of eventargs is not even updated. You must click back into the row and make the same event fire a second time before the source is updated. Why is this? Your help doc at http://www.telerik.com/help/wpf/gridview-data-editing-event-sequence.html says otherwise. The new data is already supposed to be committed.