private void mievento_panel_click(System.Object sender, EventArgs e)
        {
            id_mesa = Convert.ToInt32(((Panel)sender).Tag);
            Agregar_mesa frm = new Agregar_mesa();

            frm.FormClosed += new FormClosedEventHandler(frm_agregar_mesa_FormClosed);
            frm.ShowDialog();
        }
        private void mievento(System.Object sender, EventArgs e)
        {
            nombre_mesa = ((Button)sender).Text;
            id_mesa     = Convert.ToInt32(((Button)sender).Name);
            Agregar_mesa frm = new Agregar_mesa();

            frm.FormClosed += new FormClosedEventHandler(frm_agregar_mesa_FormClosed);
            frm.ShowDialog();
        }