jQuery Grid Plugin - jqGrid

Tony

I'm using the lasted code from github for beta 3.5.  I have the following grid:  Search toolbar opens/closes properly.  When i enter a values in the search fields and hit enter key, the URL fires to my servlet, but the _search parameter posted is always "false" and no field values are posted.  Am I doing something wrong?

jQuery(document).ready(function(){
    var mygrid = jQuery("#sgrid").jqGrid({
    url:'jqGridController?module=GetPersonnelsgridReportJSON',
    datatype: "json",
    colNames:[...
             ],
    colModel:[...
             ],
    rowNum:15,
    rowList:[10,15,20,25,30,10000], 
    rownumbers: true,
    gridview: true,
    mtype: 'POST',
    pager: jQuery('#sgridpager'),
    height: '100%',
    sortname: '1',
    sortorder: 'asc',
    viewrecords: true,
    caption: 'MultiColumn Filter Search'})
    .navGrid('#sgridpager',{view: false, edit: false, add: false,
                            del: false, search: false, refresh: false})
   .navButtonAdd("#sgridpager'",{caption:"Search",title:"Toggle Search Toolbar",
                               buttonicon:'ui-icon-pin-s',
        onClickButton:function(){
     mygrid[0].toggleToolbar()
        }
    })
    .navButtonAdd("#sgridpager'",{caption:"Clear",title:"Clear Search",
                                buttonicon :'ui-icon-refresh',
        onClickButton:function(){
     mygrid[0].clearToolbar()
        }
   });
   mygrid.filterToolbar();
});