title: Extjs store.load does not make the call
body: <p>I have the code ExtJs 4 :</p>
  
  <pre><code>var proxy = Ext.create('Ext.data.Proxy',  {
  type : 'ajax',
      url : 'some url',
      reader : {
          type : 'json'
      }
  });
  myStore.setProxy(proxy);  
  myStore.load({   // this never loads, no error in console either
      scope : this,
      params : {
      },
      callback: function() {
      }
  });
  </code></pre>