private void LoadDS_LopHoc()
 {
     this.Grid_ItemLop.Children.Clear();
     foreach (Lop_Class item in lst_LopHoc)
     {
         UserControls_UI.ItemLopHoc_UserControl itemLopHoc_UserControl = new UserControls_UI.ItemLopHoc_UserControl(item.ma_Lop, item.ten_Lop, item.ma_GiaoVien, item.siSo.ToString());
         itemLopHoc_UserControl.MouseDoubleClick += new System.Windows.Input.MouseButtonEventHandler(this.grp_UI_MouseDoubleClick);
         this.Grid_ItemLop.Children.Add(itemLopHoc_UserControl);
     }
 }
 private void grp_UI_MouseDoubleClick(object sender, MouseButtonEventArgs e)
 {
     UserControls_UI.ItemLopHoc_UserControl itemLopHoc_UserControl = sender as UserControls_UI.ItemLopHoc_UserControl;
     lvDanhSachHS.ItemsSource = vM_ThongTinLop.DanhSach_HocSinh(cbb_NamHoc.SelectedValue.ToString(), cbb_KhoiLop.SelectedValue.ToString(), itemLopHoc_UserControl.ma_LopHoc);
 }