private void timer1_Tick(object sender, EventArgs e)
        {
            int line  = Entrada.GetLineFromCharIndex(Entrada.GetFirstCharIndexOfCurrentLine());
            int colum = 1 + Entrada.SelectionStart - Entrada.GetFirstCharIndexOfCurrentLine();

            label1.Text = "line: " + line.ToString() + ", column: " + colum.ToString();
        }