title: Refresh Complete Event in Paging Toolbar in ExtJS 3.4
body: <p>I am adding a paging toolbar from below code:</p>
  
  <pre><code>this.bbar = new Ext.PagingToolbar({
      pageSize: this.pageSize,
      store: this.store,
      displayInfo: true,
      displayMsg: helpiq.i18.topiclist.display_msg,
      emptyMsg: helpiq.i18.topiclist.empty_msg     
  });
  </code></pre>
  
  <p>Now I want to add an event that calls when the toolbar refresh action is completed and also one more event that calls when changing the page completes.</p>
  
  <p>How to do this?</p>