title: jqgrid filterToolbar not working
body: <p>Well i am banging my head against the wall with this one because i have used jqgrid in many apps and similar code is working in every other case but this!
  Here is the code...</p>
  
  <pre><code>var pfct = $("#pfc_table");
  pfct.jqGrid({
          url: 'costs',
          datatype: 'json',
          'postData': JSON.stringify(getConds()),
          mtype: 'POST',
          colNames:['Id','Name','Formula','Conditions'],
          colModel :[
            {name:'id', index:'id', width:40, search:true},
            {name:'name', index:'name', width:130, search:true},
            {
                name:'formula', index:'formula',width:310, search:true,
                formatter : function(value, options, rData){
                    return value.substring(value.indexOf('=')+1);
                }
            },
            {name:'conditionstr', index:'conditionstr', width:160,search:true}
          ],
          jsonReader: {
              repeatitems:false,
              root: function (r) { return r.data.rows; },
              page: function (r) { return r.data.currpage; },
              total: function (r) { return r.data.totalpages; },
              records: function (r) { return r.data.totalrecords; }
          },
          gridComplete: function() {
          },
          gridview: true,
          height: 'auto',
          autowidth: true,
          pager: '#pfc_pager',
          rowNum:25,
          viewrecords: true,
          loadonce: true,
          ignoreCase: true,
          multiselect: false,
          pagination: true
  });
  pfct.navGrid('#pfc_pager',{edit:false,add:false,del:false,search:false,refresh:false});
  pfct.jqGrid('filterToolbar',{stringResult: true,searchOnEnter: false});
  </code></pre>
  
  <p>The json data i am sending have a few extra properties that are not defined in the colmodel but this has never been a problem in the past. Local sorting and paging works fine, but filtering does not!
  For the record this is what the data looks like:</p>
  
  <pre><code>{"data":{"totalpages":1,"currpage":1,"totalrecords":10,"rows":[{"name":"Test","id":18195,"level":0,"currency":"EUR","default":true,"formula":"f_18195()=110","ownerId":1,"categoryName":"Test cat","parentId":0,"rebate":0,"portDues":true,"modified":1310036286000,"conditionstr":"Condition 1, Condition 2"}],"userdata":null},"status":true,"responseError":null}
  </code></pre>