Filling the Total Column with jqxgrid Multiplication - jqxgrid

Question

Filling the Total Column with the jqxgrid Multiplier.
Hi there;
I want to multiply ItemQty and SinglePrice columns and write to TotalPrice column.
How can I do that.
I tried to use the code in this link but it didn't work.
The other columns show the data in the database.
var initFBListGrid=function(){
source =
{
dataType: 'json',
datafields: [
{ name: 'Id' },
{ name: 'OrderNumber' },
{ name: 'LineNumber' },
{ name: 'ItemNumber' },
{ name: 'ItemDescription' },
{ name: 'ItemQty' },
{ name: 'SinglePrice' },
{ name: 'Ixitem' },
{ name: 'IsUrgentHTML' },
{ name: 'StatusHTML' },
{ name: 'IsApproved' },
{ name: 'IsRejected' },
{ name: 'LatestPurchasePrice' },
{ name: 'PriceLevel' },
{ name: 'DeliveryDate' },
{ name: 'SupplierID' },
{ name: 'SupplierName' },
{ name: 'ProjectNumber' },
{ name: 'ProjectName' },
{ name: 'BuyerName' },
{ name: 'PendingApproverName' },
{ name: 'Company' },
{ name: 'Currency' },
{ name: 'HasAttachmentHTML' },
{ name: 'Glco' },
{ name: 'RequesterName' },
{ name: 'ApproverName' },
{
name: 'TotalPrice',
formatter: function (cellvalue, options, rowObject) {
var ItemQty = parseInt(rowObject.ItemQty, 10),
SinglePrice = parseInt(rowObject.SinglePrice,10);
return $.fmatter.util.NumberFormat(ItemQty * SinglePrice, $.jgrid.formatter.currency);
}
}
],
id: 'Id'
};