ext.net - ColumnModel Set Header error with mono 3.3.0 -

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this asp.net gridpanel code columnmodel id columnmodel3

<south split="true" collapsible="true" collapsemode="mini">                     <ext:panel runat="server" id="pnlmsglst" frame="true" height="145" title="消息列表" autoscroll="true"                         collapsed="true">                         <content>                             <ext:gridpanel id="vehgridpnl" runat="server" storeid="msgstore" striperows="true"                                 frame="true" autoheight="true" autoexpandcolumn="id" autoscroll="true" enablehdmenu="false">                                 <columnmodel id="columnmodel3" runat="server">                                     <columns>                                         <ext:column columnid="id" header="id" width="80" dataindex="id" hidden="false" />                                         <ext:column header="消息内容" width="180" dataindex="content">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="车牌号码" width="90" dataindex="carplateno">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="设备id" width="90" dataindex="devid">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="经度" width="80" dataindex="longitude">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="纬度" width="80" dataindex="latitude">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="速度" width="70" dataindex="speed">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="方向" width="70" dataindex="angle">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="定位" width="80" dataindex="location">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="时间" width="150" dataindex="date">                                             <renderer fn="change" />                                         </ext:column>                                         <ext:column header="车辆状态" width="300" dataindex="status">                                             <renderer fn="change" />                                         </ext:column>                                     </columns>                                 </columnmodel>                                 <selectionmodel>                                     <ext:rowselectionmodel id="rowselectionmodel3" singleselect="true" runat="server">                                     </ext:rowselectionmodel>                                 </selectionmodel>                             </ext:gridpanel>                         </content>                     </ext:panel>                 </south>

this javascript, when page loaded, automatically run function

function changetitle() {    vehlistpanel.settitle(vehlist_title + "  :" + nvehcount.tostring());    btnvehdetails.settext(vvehdetails);      pnlmsglst.settitle(pmsglist);      columnmodel3.setcolumnheader(1, pcontent);      columnmodel3.setcolumnheader(2, vvehnum);     columnmodel3.setcolumnheader(3, vdevid);      columnmodel3.setcolumnheader(4, plongitude);     columnmodel3.setcolumnheader(5, platitude);     columnmodel3.setcolumnheader(6, pspeed);      columnmodel3.setcolumnheader(7, pangle);     columnmodel3.setcolumnheader(8, plocate);     columnmodel3.setcolumnheader(9, ptime);      columnmodel3.setcolumnheader(10, palarmstatus); }

this function change columnmodel3 header.
unfortunately, work on iis, when m trying on real server, return error

referenceerror: columnmodel3 not defined  columnmodel3.setcolumnheader(1, pcontent);

is bug? or what? other way change column header ?

server using mono3.3.0,xsp4 , ext.net version 1.3.0
p/s : other components button,label working proper settext , settitle. columnmodel having problem.

since, way can't work, m trying on firebug change header, , way change header firebug javascript this

vehcolmodel = parent.frames["statisticfrm0_iframe"].vehgrid.colmodel  vehcolmodel.setcolumnheader(3, vvehnum); vehcolmodel.setcolumnheader(4, vdevid);

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