how to populate a webcombo inside a webgrid dynamically(INFRAGISTICS)

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C#

ASP.NET

Hy,
I am using 3rd party tool infragistics in asp.net but i am unable to
populate a webcombo inside a webgrid dynamically

I tried The following code in java script but it gave me a error saying
filterexp(i .e the varialble) was undefined


<script type="text/javascript" language="javascript" >
function dgStone_BeforeEnterEditModeHandler(gridName, cellId)
{
var cell=igtbl_getCellById(cellId);
var row=cell.Row;
var column=cell.Column;
var oCmbOrdr=igcmbo_getComboById("ctl00xContentPlaceHolder1xTabsxTabPanel1xddlPacket");
var filterexp = "Packet_Id='3'";
//oCmbOrdr.Filter = "Packet_Id='3'";
oCmbOrdr.selectWhere(filterexp);
//oCmbOrdr.Reset();
}
</script>
please help

regards
raghvendra panda