private void newToolStripMenuItem_Click(object sender, System.EventArgs e)
        {
            var child = new TextFileChildForm($"Text File {childNumber}");

            child.MdiParent = this;
            child.Show();

            childNumber++;
        }
        private void size14ToolStripMenuItem_Click(object sender, System.EventArgs e)
        {
            ClearSize();

            size14ToolStripMenuItem.Checked = true;

            if (MdiChildren.Length < 0)
            {
                TextFileChildForm child = (TextFileChildForm)this.ActiveMdiChild;
                child.ChangeTextSize(14, fontName);
            }
        }
        private void pinkToolStripMenuItem_Click(object sender, System.EventArgs e)
        {
            ClearColor();

            pinkToolStripMenuItem.Checked = true;

            if (MdiChildren.Length > 0)
            {
                TextFileChildForm child = (TextFileChildForm)this.ActiveMdiChild;
                child.ChangeTextColor(Color.Pink);
            }
        }
        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");
            }
        }