private void itemPerson_Click(object sender, EventArgs e)
        {
            FormPerson formperson = new FormPerson();

            formperson.MdiParent = this;
            formperson.Show();
        }
        private void itemSettingPersonAll_Click(object sender, EventArgs e)
        {
            FormPerson form = new FormPerson();

            form.MdiParent = this;
            form.Show();
        }