private int SortByPetAssisting(PetDataEx aItem, PetDataEx bItem)
 {
     if (!aItem.IsPetAssisting())
     {
         if (!bItem.IsPetAssisting())
         {
             return this.SortByQuality(aItem, bItem);
         }
         return 1;
     }
     else
     {
         if (!bItem.IsPetAssisting())
         {
             return -1;
         }
         return this.SortByQuality(aItem, bItem);
     }
 }