title: Ext.draw.container can't load in Ext.JS 6.5.1 and newer versions
body: <p>A simple example,</p>
  
  <pre><code>Ext.define('TestExample.view.Test', {
  extend: 'Ext.draw.Container',
  alias: 'viewmodel.schedule'
  ...
  });
  </code></pre>
  
  <p>causes a "[E] [Ext.Loader] Some requested files failed to load"</p>
  
  <p>because the class is Ext.draw.Container (It loads with any other class I've tried)</p>
  
  <p>To confirm the problem, see eg <a href="https://docs.sencha.com/extjs/6.5.1/modern/Ext.draw.Container.html" rel="nofollow noreferrer">https://docs.sencha.com/extjs/6.5.1/modern/Ext.draw.Container.html</a></p>
  
  <p>and click the run button- it fails! Try the same in version 6.2.0, and it works!</p>
  
  <p>Anyone know about this bug in the newer versions?</p>