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Setting the value of a cell

Hi guys,

Barcode inventory system, so you scan the barcode and it adds the row if it doesn't exist, if it does exist it just increments the quantity. For the life of me though I can't figure out how to update the Cell value, there's no documentation on the dhtmlXGridCellObject

function addRow(barcode){

    if (mygrid.doesRowExist(barcode)){
        //increment the value

        cell=mygrid.cellByIndex(mygrid.getRowIndex(barcode),3); //qty is the 4th column
//cell.value=cell.value+1;
        //mygrid.setUserData(1,'Qty',cell.value+1);
    } else {
//create a new row
     mygrid.addRow(barcode,[0,barcode,\"Loading...\",0,0,0],mygrid.getRowsNum());        
    }
}

>>there's no documentation on the dhtmlXGridCellObject
http://dhtmlx.com/dhxdocs/doku.php?id=dhtmlxgrid:toc#script_api_reference
http://dhtmlx.com/dhxdocs/doku.php?id=dhtmlxgrid:methods_common_for_all_types_of_excells