public static ItemsProcessingVoid <IDeleteable> LinkDeletions(this INotifyCollectionChanged collection)
        {
            void DeleteHandler(object sender, EventArgs e)
            {
                ((IList)collection).Remove(sender);
            }

            return(collection.ItemsProcessing <IDeleteable>(
                       (d, ip, o, e) => d.Deleted += DeleteHandler,
                       (d, ip, o, e) => d.Deleted -= DeleteHandler
                       ));
        }