title: How to set tooltip for treelist in ExtJS?
body: <p>I'm developing an ExtJs application.
  I want to use a <a href="http://docs.sencha.com/extjs/6.0/6.0.0-classic/#!/api/Ext.list.Tree" rel="nofollow">treelist</a> as follow:</p>
  
  <pre><code>{
      xtype: 'treelist',
      bind: '{navimgation}',
      ...
  }
  </code></pre>
  
  <p>My <code>navimgation</code> in my model is as follow:</p>
  
  <pre><code>navimgation: {
      type: 'tree',
      root: {
          children: [{
              text: 'Node1',
              leaf: true,
              qtip: 'My qtip 1'
          },{
              text: 'Node2',
              leaf: true,
              qtip: 'My qtip 2'
          }
          ...
          ]
      }
  }
  </code></pre>
  
  <p>I want to show a tooltip when mouse is over node, but it is not working.</p>