title: how to refresh Window in extjs
body: <p>I have one window in that I passed two dynamic <code>gridpanel</code> </p>
  
  <p>1) FeaturGrid </p>
  
  <p>2) gvpropertywn.</p>
  
  <p>I want to refresh testWin (Window) how i can?</p>
  
  <p>can u pls help me?</p>
  
  <pre><code>var testWin = new Ext.Window({
      id: 'resultwindow',
      title: LangVarTestWinText,
      width: 400,
      height: 300,
      layout: 'border',
      closeAction: 'hide',
  
      closable: true,
      //items:[FeaturGrid]
      items: [FeaturGrid, gvpropertywn]
  });
  </code></pre>