title: Extjs 4: Create an iFrame Window
body: <p>I am in need of creating an iFrame Window in Extjs. Previously in ExtJS 3.x I would do this:</p>
  
  <pre><code>bodyCfg: {
      tag: 'iframe'
  }
  </code></pre>
  
  <p>But the <code>Window</code> Class of ExtJS 4 seems not to have a bodyCfg.</p>
  
  <p>Any ideas on how to make an iFrame ExtJS 4 Window?</p>