jQuery Grid Plugin - jqGrid

I am having problem displaying my userdata on the grid footer. I think the problem is that because my colModel name is retrieving the data from a pojo.

In all examples I have seen like in Olegs response: http://stackoverflow.com/quest.....-in-jqgrid

& /blog/jqgrid/jqgrid.html (Summary Row Footer) the colModels are like:

{name:'amount',index:'amount', width:80, align:"right", formatter: 'number'},

However my colNames are pojos and are like:

{name:'weekend.amount',index:'amount', width:80, align:"right", formatter: 'number'},

I send my JSON user data like: "userdata":{"weekend.amount":667.0} but nothing gets displayed on the grid.

I even tried just putting "userdata":{"amount":667.0}} but nothing happens.

Is it a case where by that displaying userdata as a row footer doesn't work for Pojos? I need urgent help on this. Thank you.