private void button3_Click(object sender, EventArgs e)
        {
            //acceso ventana configuracion
            this.Close();

            Form7 Registrar = new Form7();
            Registrar.Show();
        }
        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();

            Form7 configur = new Form7();
            configur.Show();
        }