jQuery Grid Plugin - jqGrid

Hello, i have a problen and not found a solution in documentation.I have a jqgrid with celledit enamble. When i edit a cell, save the content in the server and this respond with de id key assigned to a row in a database.

Then i nedd to add this key to jqgrid structure, without reload a grid. If i try use for example

afterSubmitCell:function(serverresponse, rowid, cellname, value, iRow, iCol){
            response = eval('(' + serverresponse.responseText + ')');
          $("#selector").editCell(iRow,0,response.id);           
            return true;
        }

Fire save method, an have twice object saved in database.

Thank you