public MainViewModel()
 {
     cellList.AddReference(ref cell1);
     cellList.AddReference(ref cell2);
     cellList.AddReference(ref cell3);
     cellList.AddReference(ref cell4);
     cellList.AddReference(ref cell5);
     cellList.AddReference(ref cell6);
     cellList.AddReference(ref cell7);
     cellList.AddReference(ref cell8);
     cellList.AddReference(ref cell9);
     cellList.AddReference(ref cell10);
     cellList.AddReference(ref cell11);
     cellList.AddReference(ref cell12);
     cellList.AddReference(ref cell13);
     cellList.AddReference(ref cell14);
     cellList.AddReference(ref cell15);
     cellList.AddReference(ref cell16);
 }