C# using tablelayoutpanel spanning w/o adding new rows/columns?

private void control_TextChanged(object sender, EventArgs e)
        {
            string str = control.Text;
            if (str.Contains("Follow-Up"))
            {
                table.SetColumnSpan(control, 1);
                table.SetRowSpan(control, 2);
                control.BackColor = Color.PowderBlue;
            }
            else if (str.Contains("Admit"))
            {
                table.SetColumnSpan(control, 1);
                table.SetRowSpan(control, 4);
                control.BackColor = Color.Lavender;
            }
            else
            {
                table.SetColumnSpan(control, 1);
                table.SetRowSpan(control, 1);
                control.BackColor = Color.White;
            }
        }

        private void textbox_Enter(object sender, EventArgs e)
        {
            control = (TextBox)sender;
        }