title: New Object not triggering createRecord in DataSource
body: <p>In my responder I have:</p>
  
  <pre><code>Spanish.ADDWORD = SC.Responder.create({
  
    didBecomeFirstResponder: function(responder) {
      var store = this._store = Spanish.store.chain(); //buffer changes
      var word = store.createRecord(Spanish.Word, {word: "", english: ""});
      Spanish.addWordController.set("content",word);
  
      //show the dialog
      var pane = Spanish.getPath('addWordPage.mainPane');
      pane.append();
      pane.makeFirstResponder();
    },      
  
    submit: function(){
      this._store.commitChanges().destroy();
      Spanish.makeFirstResponder(Spanish.READY);
    }
  }
  </code></pre>
  
  <p>Before I had the DataSource hooked-up, and I was using local, everything worked. When I click submit now no new object is created and createRecord is not being called.</p>