public void MoveItemBetweenList(string listToList)
        {
            if (listToList == "1to2")
            {
                // Move selected item from list 1 to list 2

                AListItemViewModel selectedItem = ListOne.SelectedItem;
                ListOne.RemoveFromList(selectedItem);
                ListTwo.AddToList(selectedItem);
            }

            if (listToList == "2to1")
            {
                // Move selected item from list 2 to list 1

                AListItemViewModel selectedItem = ListTwo.SelectedItem;
                ListTwo.RemoveFromList(selectedItem);
                ListOne.AddToList(selectedItem);
            }
        }