/// <summary>
 /// Keyboard event handler for palette... need to assign it to each thumbnail too, I guess?
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 public void RemoveSelectedItems()
 {
     if (mySelectedThumbnail != null && mySelectedThumbnail.CanRemove)
     {
         if (mySelectedThumbnail.CanRemove)
         {
             Bitmaps.RemoveItem(mySelectedThumbnail.ThumbnailOf);
         }
     }
     if (bHasMultiselection)
     {
         foreach (var thumb in GetMultiselectedThumbnails())
         {
             if (thumb.CanRemove)
             {
                 Bitmaps.RemoveItem(thumb.ThumbnailOf);
             }
         }
     }
 }