title: load jqgrid via ajax to dialog search options dropdown don't work
body: <p>When I use my jqgrid (v.4.6) on page evrything is ok.
  When I load jqgrid via ajax to jquery dialog searchoptions dropdown list doesn't work for me.
  In jqgrid search box searchoptions dropdown list doesn't work for me either.</p>
  
  <pre><code>$(document).ready(function(){
  
          jQuery("#list_bs").jqGrid({
      url:'some.php',
      datatype: "json",
      height: 450,
      width: 1050,
  
      colNames:['FirstName','Name','Date'],
      colModel:[  
  
                  {name:'FirstName',index:'FirstName', width:200,  sorttype:'string', searchoptions:{sopt:['bw','bn','cn','ne','ew','en']}},
                  {name:'Name',index:'Name', width:200,  sorttype:'string', searchoptions:{sopt:['bw','bn','cn','ne','ew','en']}},
                  {name:'Date',index:'Date', width:100,  sorttype:'string', searchoptions:{sopt:['bw','bn','cn','ne','ew','en']}},
  
      ],
      rowNum:50,
      rowList : [20,30,50],
      loadonce:false,
          multiselect : false,
      mtype: "GET", 
          shrinkToFit: false,
      rownumbers: true,  
      gridview: true,
      pager: '#pager',
      sortname: 'Name',
          viewrecords: true,
          sortorder: "ASC",
          toolbar: [true,"top"],
  
  
  });
  $("#list_bs").jqGrid('navGrid', '#pager_bs', 
                  {
  
              edit:false,
  
                add:false , 
  
                  del:false,
                  },
                  {},
                  {},
                  {},
                  {    
                      multipleSearch: true,
                      showQuery: true
                  }
                 ......
              )
              });
  
  jQuery("#list_bs").jqGrid('filterToolbar',{ searchOperators: true,stringResult:true, searchOnEnter: false, autosearch: true ,enableClear: false});
  </code></pre>