Hi Jean-Pascal,

Thank you for your post. I have been looking into your requirement and instead of handling the event you could make the editor stay in edit mode, if its value is null like e.g.:

   private void DataPresenterBase_EditModeEnded(object sender, Infragistics.Windows.DataPresenter.Events.EditModeEndedEventArgs e)

        {

            if (e.Cell.Value == null)

            {

                e.Editor.StartEditMode();

            }

        }

Let me know, if you need any further assistance on this matter.