title: Extjs 4 - How to up to parent component in initComponent function
body: <p>I define a gridpanel like</p>
  
  <pre><code>    Ext.define('Example', {
          extend: 'Ext.grid.Panel',   
          alias: 'myGrid',
          store:Ext.create('Ext.data.Store', {
              fields: [
                  {name: 'name'}
              ]
          }),
          initComponent: function() {
               alert(this.up('window').title); //but error like this.up(...) is undefined
               this.callParent(arguments);
          }
      ...
  </code></pre>
  
  <p>And I create a window have a item above </p>
  
  <pre><code>   items: {  
          xtype: 'myGrid'
      }
  </code></pre>
  
  <p>I want to get some thing in parent componet. How to up to <code>parent component</code> in initComponent function. Thanks</p>