title: List not scrolling
body: <p>I have a panel (layout:'vbox') with two items; a panel and a list. </p>
  
  <p><strong>Code</strong></p>
  
  <pre><code>this.currentFolderPnl = new Ext.Panel({
      cls:'document-current-folder-panel',
      html:'/'
  });
  
  this.list = new Ext.List({
      scroll: 'vertical',
      cls:'document-list',
      id: 'document-list',
      store: app.stores.Document,
      itemTpl: app.templates.document
  });
  
  app.views.DocumentList.superclass.constructor.call(this, {
      selectedCls : "x-item-selected",
      dockedItems: [{
          xtype: 'toolbar',
          ui:'dark',
          title: 'Documents',
          items:[this.backBtn,{xtype:'spacer'},this.newBtn]
      }],
      layout: {type:'vbox',align:'stretch'},
      items: [
          this.currentFolderPnl,
          this.list
      ]
  });
  </code></pre>
  
  <p>I have tried many things but nothing worked. Could somebody tell me what to do.</p>
  
  <p>Thanks</p>