title: ExtJS: How detach or promote source code HtmlEditor?
body: <p>How detach or promote source code mode window of HtmlEditor in another textarea?
  I mean , How source code when typing in HtmlEditor may be displayed in another textarea element?</p>
  
  <p>I create form with HtmlEditor &amp; form with Textarea, and I assume that it is necessary to attach listner to 'textareafield' and get data from HtmlEditor textarea in source mode, but do not know how it to make.</p>
  
  <pre><code>{
      xtype: 'htmleditor',
      listeners: {
         }
      },
  
   ...
  
    {
      xtype: 'form',
      layout: {
        type: 'fit'
      },
      title: 'Source Code',
      flex: 1,
      items: [
      {
        xtype: 'textareafield',
        id:'textareaEl'
      }
      ]
    }
  </code></pre>