AjaxControlToolkit Accordion运用

<asp:Accordion ID="adTree" AutoSize ="None"   runat="server"  HeaderCssClass ="bgs type typetop"
        FadeTransitions="True" FramesPerSecond="45" Width="182px" 
        RequireOpenedPane="False">        
    </asp:Accordion>

后台代码：

protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                BindTree();
            }
        }

        private void BindTree()
        {
            SqlDataReader sdr = md.GetNewsClass();
            while (sdr.Read())
            {
                AccordionPane ap = new AccordionPane();
                Table tab = new Table();
                tab.CellPadding = 0;
                tab.CellSpacing = 0;
                tab.BorderWidth = Unit.Pixel(0);
                tab.Height = Unit.Pixel(25);
                TableRow tr = new TableRow();
                TableCell td = new TableCell();
                td.Text = sdr["ClassName"].ToString();
                td.CssClass = "tops";
                tr.Cells.Add(td);
                tab.Rows.Add(tr);
                ap.HeaderContainer.ID = "D" + sdr["ID"].ToString();
                ap.HeaderCssClass = "bgs";
                ap.HeaderContainer.Width = Unit.Pixel(182);
                ap.HeaderContainer.Controls.Add(tab);

                int id = Convert.ToInt32(sdr["ID"].ToString());
                SqlDataReader sdr1 =mwt.GetNewsTitle(id);
                while (sdr1.Read())
                {
                    Table tabs = new Table();
                    tabs.CellPadding = 0;
                    tabs.CellSpacing = 0;
                    tabs.BorderWidth = Unit.Pixel(0);
                    TableRow trs = new TableRow();
                    TableCell tds = new TableCell();
                    tabs.CssClass = "MM";
                    tds.Text = "<a target='_blank' href=ShowNews.aspx?ID=" + sdr1["ID"].ToString() + ">" + sdr1["Title"].ToString() + "</a>";
                    trs.Cells.Add(tds);
                    tabs.Rows.Add(trs);
                    ap.ContentContainer.Width = Unit.Pixel(182);
                    ap.ContentContainer.ID = "CC" + sdr1["ID"].ToString();
                    ap.ContentContainer.CssClass = "CC";
                    ap.ContentContainer.Controls.Add(tabs);
                }
                sdr1.Close();
                adTree.Panes.Add(ap);
            }
            sdr.Close();
        }