private void Btn_DatVe_Click(object sender, EventArgs e)
 {
     Pn_main_function.Focus();
     MyResources.ShowFormDatVe();
 }
 private void Btn_PhongChieuPhim_Click(object sender, EventArgs e)
 {
     Pn_main_function.Focus();
     MyResources.ShowFormPhongChieuPhim();
 }