title: ExtJs 4 Store's AJAX proxy is not called on Store add — what is missing?
body: <p>I have a Grid, a Store and Model for its data and AJAX proxy for the Store that is pointing to my self-written PHP back-end. The PHP backend writes to log each time it is called.</p>
  
  <p>The system works OK for Read, Update and Delete calls. However now I need to add new  field to Store, which I do in such a way:</p>
  
  <p>(here, some new data were generated...)</p>
  
  <pre><code>var newEntry=Ext.ModelManager.create({   
       id:id,
       title: title,
       url: '/php/'+fname,
       minithumb: '/php/'+small,
       thumb:'/php/'+thumb
                  }, 'MyApp.model.fileListModel');
   var store=Ext.getCmp('currGallery').getStore();
   store.add(newEntry);
      store.sync();
  </code></pre>
  
  <p>I have the new line appearing in the Grid.
   But with or withour sync() call, I have no calls going to my PHP back end. It however reads one more time. Store has parameter autoSync :true and does great updating data automatically when I edit existing line in the Grid.</p>
  
  <p>What am I missing?</p>