Need to sort specific column in datatable.

Hi,

I am using jquery datatable plugin in MVC app. I did disable sorting for certain columns as said in examples in datatable plugin examples but its not working for disabled sorting columns. it works for all columns still. so please help me on this..

oTable = $('#companies').dataTable({
"bSort": true,
"bJQueryUI": true,
"bPaginate": true,
"bFilter": true,
"sScrollX": "100%",
"sScrollXInner": "100%",
"bScrollCollapse": true,
"aLengthMenu": [[5, 10, 20, 50, 100], [5, 10, 20, 50, 100]],
"bServerSide": true,
"sAjaxSource": "Some URL",
"aoColumnDefs": [
{ "bSortable": false, 'aTargets': [0,4] }
],
"aoColumns": [
{"bSortable": false, "bSearchable": false,
"fnRender": function (oObj) {
currentId = oObj.aData[0];
var check = ('@ViewData["DealerId"]' != '') ? (('@ViewData["DealerId"]' == oObj.aData[0]) ? "checked='checked'" : '') : '';
if ('@ViewData["DealerId"]' != '') {
if ('@ViewData["DealerId"]' == oObj.aData[0])
FillRegistrationForm(oObj.aData[0], oObj.aData[5]);
}
return '<input type="radio" onclick="FillRegistrationForm(\'' + oObj.aData[0] + '\',\'' + oObj.aData[5] + '\')" style="opacity:100" id=' + oObj.aData[0] + ' name="dreg" ' + check + ' />';
}
},
{ "bSortable": true, "sName": "DealerCode" },
{ "bSortable": true, "sName": "ShipperCode" },
{ "bSortable": true, "sName": "AffiliationCode" },
{ /* Dealer Information */
"bSortable": false, "bSearchable": false,
"fnRender": function (oObj) {
return oObj.aData[4];
}
},
{ "bSortable": true, "sName": "Registered" },
{ "bSortable": false, "bSearchable": false,
"fnRender": function (oObj) {
var disabled = "";
if (oObj.aData[5] == "Unregistered") disabled = "disabled='disabled'";
if (oObj.aData[6] == '1')
return '<input type="checkbox" ' + disabled + ' onclick="return SetDealerActiveInactive(\'' + currentId + '\')" checked="checked" style="opacity:100" />';
else
return '<input type="checkbox" ' + disabled + ' onclick="return SetDealerActiveInactive(\'' + currentId + '\')" style="opacity:100" />';
}
}
]
});