title: Why do I lose panel title if I put paramters into config block in ExtJS?
body: <p>Here is a simple panel with a title "My Window": </p>
  
  <pre><code>Ext.define('MyApp.MyWindow', {
      extend : 'Ext.panel.Panel',
      title : 'My Window',
      html : '&lt;p&gt;This is a test&lt;/p&gt;',
      renderTo : Ext.getBody()
  }); 
  </code></pre>
  
  <p>If I put the title into config block, the title will not show. Do you know why?</p>
  
  <pre><code>Ext.define('MyApp.MyWindow', {
      extend : 'Ext.panel.Panel',
      config : {
          title : 'My Window',
          html : '&lt;p&gt;This is a test&lt;/p&gt;'
      },
      renderTo : Ext.getBody()
  });
  </code></pre>