private void OnStep(Int32 index)
        {
            MinesweeperField field = Fields[index];

            _model.Step(field.X, field.Y);
            RefreshTable();
        }
        private void OnAlert(Int32 index)
        {
            MinesweeperField field = Fields[index];

            if (field.Color == "Red")
            {
                field.Color = "White";
            }
            else
            {
                field.Color = "Red";
            }
            RefreshTable();
        }