Custom Attributes to Cell in DhtmlxGrid binding with JSON

How we bind custom attribute like id, type class to particular cell in grid with Json ?

I pass data as below :

var data = {
rows: [

               id: 1003,
               userdata: { "tagged": "1" },
               data: [
                  {"value":'dfgdgdg', "id":124423 },
                    "John Grisham",

but it displayed [object object ] in grid.

So please do need full for DHTMLXGrid data binding with custom attribute using Json format.

Thank you,
Devanhi gandhi

using attributes in json is available in PRO version of the dhtmlxGrid only.