private void btnEdit_Click(object sender, RoutedEventArgs e)
        {
            UserControl usc = new UI_LapPhieuDatHang(dgvPhieuDatHang.SelectedItem as DTO_PhieuDatHang);

            UI_ManHinhChinh.gridMain.Children.Clear();
            UI_ManHinhChinh.gridMain.Children.Add(usc);
        }
        private void btnLapPhieu_Click(object sender, RoutedEventArgs e)
        {
            UserControl usc = new UI_LapPhieuDatHang();

            UI_ManHinhChinh.gridMain.Children.Clear();
            UI_ManHinhChinh.gridMain.Children.Add(usc);
        }