title: ExtJS JsonStore not populating
body: <p>My JsonStore does not seem to be populating.  When I run the code, it fires off the request, which does return the json.  When I inspect the data store, the data array is empty.</p>
  
  <p>What I am missing? Thanks.</p>
  
  <p>I have this JsonStore defined:</p>
  
  <pre><code>CCList.ListStore = new Ext.data.JsonStore({
      root: 'rows',
      idProperty: 'Id',
      fields: ['Id', 'Description'],
      autoLoad: true,
      proxy: new Ext.data.HttpProxy({
          method: 'GET',
          url: '/costcenters/getjson'
      }),
      listeners: {
          load: function (obj, records) {
              Ext.each(records, function (rec) {
                  console.log(rec.get('Id'));
              });
          }
      }
  });
  </code></pre>
  
  <p>Trying to bind it to this Ext.List</p>
  
  <pre><code>CCList.listPanel = new Ext.List({
              id: 'indexList',
              store: CCList.ListStore,
              itemTpl: '&lt;div class="costcenter"&gt;{Id}-{Description}&lt;/div&gt;'
              }
          });
  </code></pre>
  
  <p>My url returns this json:</p>
  
  <pre><code>{ "rows" : [ 
        { "Description" : "Jason",
          "Id" : "100"
        },
        { "Description" : "Andrew",
          "Id" : "200"
        }          
      ] }
  </code></pre>