private void m_cmd_bc_nam_ItemClick(object sender, ItemClickEventArgs e)
 {
     try
     {
         f491_rpt_bao_cao_tong_hop_thu_nhap_theo_nam v_f = new f491_rpt_bao_cao_tong_hop_thu_nhap_theo_nam();
         if(IsExistFormName(v_f)) return;
         v_f.MdiParent = this;
         v_f.Show();
     }
     catch(Exception v_e)
     {
         CSystemLog_301.ExceptionHandle(v_e);
     }
 }