private void btnQuyenNhanVien_Click(object sender, RoutedEventArgs e) { if (lvData.SelectedItems.Count > 0) { Data.QUYEN item = (Data.QUYEN)lvData.SelectedItems[0]; WindowThemQuyenNhanVien win = new WindowThemQuyenNhanVien(item, mTransit); win.ShowDialog(); } }