jQuery Grid Plugin - jqGrid

Is there a way to edit the hidden columns with editGridRow?

{name:'i_quantity', index:'i_quantity', width:40, align:'center',
                      resizable: false,
                      label: 'Qty',
                      editable: true,
                      editrules:{integer:true,required:true}}

{name:'i_serial_number', index:'i_serial_number', width:178, align: 'left',
                      resizable: false,
                      hidden: true,
                      label: 'Serial Number',
                      editable: true,
                      edittype: 'text'}

The first item appears when I edit the row but the second don't. If I set hidden: false it will work but I need this field be hidden to save space at grid The grid would be too big if I enable all columns, they are 20 properties per row, I only display 10.

Thanks,

Rodolfo.