Row Grouping in Datatables ver 1.8.1

Kalaiselvan

Hi,
Am using Datatables version 1.8.1 to bind the datas with Group Headers. Follows the Script

$(document).ready(function () {


var StateTable = $('#salesReport').dataTable(
{
"sAjaxSource": "Home/GetDataTableSales"
}).rowGrouping();

});

Unable to get the Row Grouping from this Script. Here salesReport is my Table name and GetDataTblesSale is my function name.
It lists out nearly 1 Lac records. With my first column is StateName. Need those State datas to be Grouped and shows Sub totals for Each States.
Please help me to fix this Issue.

Ex: Datatable Output:
[State] [District] [Population] [Area]
TN Chennai 50000 350
TN Madurai 40000 250
TN Trichy 30000 300
AP Nellore 45000 100
AP Vizag 30000 200

Expected Output:

[State] [District] [Population] [Area]
TN Chennai 50000 350
TN Madurai 40000 250
TN Trichy 30000 300
Sub Total 120000 900
AP Nellore 45000 100
AP Vizag 30000 200
Sub Total 75000 300