Quiero establecer algunas filas fijas en la cabecera de la tabla de datos.

Esta es mi configuración de tabla de datos:

var oTable = $('#transactions').dataTable( {
    "aaSorting": [ [0,'desc'] ],
    "bFilter": false,
    "bSort": true, 
    "aaSorting": [[3,'desc']], // default search colums
    //            "aaSortingFixed": [[3,'desc']],
    "bPaginate": true,
    "bProcessing": true,
    "sPaginationType": "full_numbers",
    "asStripeClasses": [ 'monitoring-table-new' ],
    "bAutoWidth": false,
    "aoColumns": [
        {   "sType": "custom",
            "sClass": "td-date-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="date"><em>' + sVal + '</em></span></div></div>';
            }
        },
        {   "sType": "custom",
            "sClass": "td-transaction-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="transaction"><em>' + sVal + '</em></span></div></div>';
            }
        },
        {   "sType": "custom",
            "sClass": "td-client-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="client"><div>' + sVal + '</div></span></div></div>';
            } 
        },
        {   "sType": "custom",
            "sClass": "td-value-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="value"><em>' + sVal + '</em></span></div></div>';
            }
        },
        {   "sType": "custom",
            "sClass": "td-status-size-cell",
            "fnRender": function ( oObj, sVal ) {
                return '<div class="monitoring-head-new leadencolor"><div class="form-border"><span class="status"><div>' + sVal + '</div></span></div></div>';
            }
        },
    ],
    "sAjaxSource": '<?php echo url_for('@test?sf_format=json'); ?>',  

} );

He hecho de la siguiente manera:

   jQuery.fn.dataTableExt.oSort['custom-asc']  = function(x,y) {
        if (x.indexOf("MY VALUE") != -1) return -1; // keep this row at top
        if (y.indexOf("MY VALUE") != -1) return 1; // keep this row at top

        return ((x < y) ? -1 : ((x > y) ?  1 : 0));
    };

    jQuery.fn.dataTableExt.oSort['custom-desc'] = function(x,y) {
        if (x.indexOf("MY VALUE") != -1) return 1; // keep this row at top
        if (y.indexOf("MY VALUE") != -1) return -1; // keep this row at top

        return ((x < y) ?  1 : ((x > y) ? -1 : 0));
    };

Esto mantendrá en la posición superior las filas que tienen "MI VALOR" en el texto. Pero el problema es que cuando clasifico en otra columna, la fila "fija" no permanece en la parte superior de la tabla.

¿Alguna solución?