title: How to hide horizontal line in extjs
body: <pre><code>this.horizontalLine = {
      xtype: 'box',
      hidden: false,
      autoEl : {
          tag : 'hr'
      }
  };
  </code></pre>
  
  <p>I want to hide this horizontal line. But </p>
  
  <pre><code>this.horizontalLine.hide()
  </code></pre>
  
  <p>is undefined.
  I tried using <code>this.horizontalLine.hidden = true</code> also. In that case, hidden property is set as true but the line is still visible. Is there some other way to do this?</p>