private void DisplayThirdLevel() { B2.Clear(); B3.Clear(); B3.ReadOnly = false; B5.Clear(); B7.Clear(); B8.Clear(); B10.Clear(); B11.Clear(); B11.ReadOnly = false; B13.Clear(); B14.Clear(); B14.ReadOnly = false; B15.Clear(); B16.Clear(); B4.Text = "2"; B4.ReadOnly = true; B12.Text = "1"; B12.ReadOnly = true; }