private void buttonTimer_Tick(object sender, EventArgs e)
        {
            i++;
            switch (i)
            {
            case 1:
                BtCreateOrder.Show();
                break;

            case 2:
                BtSave.Show(); break;

            case 3:
                BtPrint.Show(); break;

            case 4:
                BtEdit.Show(); break;

            case 5:
                BtDelete.Show(); break;

            default:
                break;
            }
            if (i == 6)
            {
                i = 0;
                buttonTimer.Stop();
            }
        }