private void crearToolStripMenuItem_Click(object sender, EventArgs e)
        {
            filePath = "";
            ArchivoFuente newMDIChild = new ArchivoFuente();

            newMDIChild.MdiParent = this;
            archfuente            = newMDIChild;
            archfuente.Show();
        }
        private void cerrarToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ArchivoFuente newMDIChild = new ArchivoFuente();

            newMDIChild.MdiParent = this;
            archfuente            = newMDIChild;
            archfuente.Show();
            System.IO.StreamReader file = null;
            filePath = "";
            string linea = "";

            try
            {
                using (OpenFileDialog openFileDialog = new OpenFileDialog())
                {
                    openFileDialog.Filter           = "SIC estandar (*.s)|*.s|SICXE (*.x)|*.x";
                    openFileDialog.FilterIndex      = 2;
                    openFileDialog.RestoreDirectory = true;
                    if (openFileDialog.ShowDialog() == DialogResult.OK)
                    {
                        filePath = openFileDialog.FileName;
                    }
                }
                if (filePath[filePath.Length - 1] == 'x')
                {
                    extendido = true;
                }
                else
                {
                    extendido = false;
                }
                file = new System.IO.StreamReader(filePath);
                while ((linea = file.ReadLine()) != null)
                {
                    newMDIChild.cambiarText(linea + '\n');
                }
                file.Close();
            }
            catch (Exception ex)
            {
                System.Console.WriteLine("Archivo inexistente");
            }
        }