title: jqGrid postData empty when use with ajaxGridOptions
body: <p>Below is my jqGrid initialisation:</p>
  
  <pre><code>            jQuery("#dataGrid").jqGrid({
              jsonReader : {
                root:"rows",
                page: "page",
                total: "total",
                records: "records",
                cell: "",
                id: "0" 
             },
             postData: {
             page: function() { return page; }
             },
              url: 'WebService.asmx/GetData',
              datatype: "json",
              mtype: "POST",
              ajaxGridOptions: {
                 contentType: "application/json; charset=utf-8"
              },
              serializeGridData: function (data) {
                  return JSON.stringify(data);
              },
              colNames: [&lt;%= colName %&gt;],
              colModel: [&lt;%= colModal %&gt;],
              rowNum: 10,
              rowList: [10, 20, 30],
             pager: '#dataGrid_Pager',
              sortname: 'name',
              viewrecords: true,
              sortorder: "name",
              caption: "JSON Example"
          });
  </code></pre>
  
  <p>There is no problem displaying the data on the grid. However, in my web service the postData is empty. i.e. context.request.form(0) is empty.</p>
  
  <p>When I removed this from the code:</p>
  
  <pre><code>ajaxGridOptions: {
                 contentType: "application/json; charset=utf-8"
              },
  </code></pre>
  
  <p>postData contains this when I add a watch to context.request.form(0):</p>
  
  <pre><code>{"page":1,"_search":false,"nd":1394031676148,"rows":10,"sidx":"name","sord":"name"}
  </code></pre>
  
  <p>But now, the grid is empty with no grid data.</p>
  
  <p>Seems like postData is conflicting with the ajaxGridOptions?</p>
  
  <p>Anyone can advise? I need both of them to work together.</p>
  
  <p>Thanks!</p>