/// header
                    if (!headerPrepared && currentRow == -1)
                    {
                        TableHeaderRow thr = new TableHeaderRow();
                        thr.Controls.Add(new TableCell());
                        thr.Controls.Add(NewCell(dr.Field<string>("descr")));
                        target.Rows.Add(thr);
                        columnKeys.Add(dr.Field<int>(columnName));
                        

pe2 = new PivotExt();
                pe2.XML = Kit.GetXML("~/Schemas/EngineMeasurement.xml");
                pe2.target = tblEM;
                pe2.dataSource = KB.GetFlightParameters(2664
                                                     , int.Parse(ddlFData.SelectedValue)
                                                     , Session["Flight"]
                                                     , "Engine");
                pe2.prefix = "pe2";
                pe2.validationGroup = "vgRLS";
                pe2.DataBind();

<asp:Table ID="tblEM" runat="server" 
                        BorderStyle="Solid" BorderWidth="1px" >
                        <asp:TableHeaderRow runat="server" CssClass="someCSS" />
                    </asp:Table>