private void courierNewToolStripMenuItem_Click(object sender, System.EventArgs e)
        {
            ClearFont();

            courierNewToolStripMenuItem.Checked = true;

            if (MdiChildren.Length > 0)
            {
                TextFileChildForm child = (TextFileChildForm)this.ActiveMdiChild;
                child.ChangeTextFont(size, "Courier New");
            }
        }
        private void microsoftSansSerifToolStripMenuItem_Click(object sender, System.EventArgs e)
        {
            ClearFont();

            microsoftSansSerifToolStripMenuItem.Checked = true;

            if (MdiChildren.Length > 0)
            {
                TextFileChildForm child = (TextFileChildForm)this.ActiveMdiChild;
                child.ChangeTextFont(size, "Microsoft Sans Serif");
            }
        }