title: Sencha Touch 2 list is invisible in container
body: <p>I'm trying to write simple view with list on container but i have some problems.
  First of all, the List is not visible when I'm trying to do it like this:</p>
  
  <pre><code> Ext.define('App.view.News', {
      extend: 'Ext.Container', 
  </code></pre>
  
  <p>but when it's written like this:</p>
  
  <pre><code>Ext.define('App.view.News', {
      extend: 'Ext.navigation.View',
  </code></pre>
  
  <p>it works.</p>
  
  <p>The problem is that when I write it with extend of navigation.View, im getting two toolbars on top and I can't find solution to disable the second one (added by the list).</p>
  
  <p>Full code:</p>
  
  <pre><code>Ext.define('App.view.News', {
      extend: 'Ext.Container', //Ext.navigation.View
      xtype: 'news',
      requires: [
          'Ext.dataview.List',
          'Ext.data.proxy.JsonP',
          'Ext.data.Store'
      ],
      config: {
          style: ' background-color:white;',
  
          items: 
          [
              {
                  xtype: 'toolbar',
                  docked: 'top',
                  title: 'News',
                  minHeight: '60px',
                  items: [
                      {
                          ui: 'back',
                          xtype: 'button',
                          id: 'backButton', 
                          text: 'Back',
                      },
  
                      {
                          minHeight: '60px',
                          right: '5px',
                          html: ['&lt;img src="resources/images/Image.png"/ style="height: 100%; "&gt;',].join(""),
                      },
                  ],          
              },
  
              { 
                  xtype: 'list',
                  itemTpl: '{title},{author}',
                  store: {
                      autoLoad: true,
                      fields : ['title', 'author'],
                      proxy: {
                          type: 'jsonp',
                          url: 'https://ajax.googleapis.com/ajax/services/feed/load?v=1.0&amp;q=http://feeds.feedburner.com/SenchaBlog',
                          reader: {
                              type: 'json',
                              rootProperty: 'responseData.feed.entries'
                          }
                      }
                  }
              }   
          ]
      }
  });
  </code></pre>
  
  <p>Help please!</p>