/// <summary>
 ///     When on a note drag completed, remove it from the note list in the notebook.
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="args"></param>
 private void NoteListView_OnDragItemsCompleted(ListViewBase sender, DragItemsCompletedEventArgs args)
 {
     Debug.WriteLine($"\n{sender}.{sender.GetHashCode()}.OnDragItemsCompleted");
     if (args.DropResult != DataPackageOperation.Move)
     {
         return;
     }
     if (!((sender as ListView)?.DataContext is Notebook notebook))
     {
         return;
     }
     Debug.WriteLine($"\tsource = {notebook}");
     if (!IsDragEntered)
     {
         return;
     }
     args.Items?.Cast <Note>().ToList().ForEach(note => notebook.Notes.Remove(note));
 }