title: Extjs Combo diplay value - if value is not found
body: <p>I am using this technique to accomplish an auto-complete feature for a combo box <a href="http://cdn.sencha.com/ext-4.1.1a-gpl/examples/form/forum-search.html" rel="nofollow">http://cdn.sencha.com/ext-4.1.1a-gpl/examples/form/forum-search.html</a> , it returns name and type of a car, sometimes the type is unknown so nothing returns, I would like it to be "No Data" so I used this <code>valueNotFoundText: 'No Data'</code> but didn't work</p>
  
  <pre><code>xtype: 'combo',
  store: s,
  hideTrigger:true,
  typeAhead: false,
  id: 'search',
  queryMode: 'remote',
  queryParam: 'query',
  displayField: 'name',//+'type',
  valueField: 'name',//+'type',
  //valueNotFoundText: 'No Data',
   ,listConfig: {
                  loadingText: ' Loading...',
                  getInnerTpl: function() {
           return  '{name}'+'&lt;br&gt;'+'&lt;p&gt;&lt;font size="1"&gt;{type}'+':type&lt;/font&gt;&lt;/p&gt;';
                  }
                  ,
              }
              ,  listeners: { 
  </code></pre>