public void PictureClicked(SongPicture sp)
 {
     foreach (var s in PictureList)
     {
         if (sp == s)
         {
             s.Current = true;
         }
         else
         {
             s.Current = false;
         }
     }
 }
        public void PictureSelected(SongPicture sp, bool?isChecked)
        {
            int icount = 0;

            foreach (var p in PictureList)
            {
                if (p.Selected)
                {
                    icount++;
                }
            }

            SelectedImagesCount = icount;
        }