title: Calling function from Ext JS 4 combo box listeners
body: <p>I am having problems in calling the custom function from combo box listeners in Ext JS 4.
  I have set up combo box listeners like below.</p>
  
  <pre><code>listeners:{
      select:{
          fn:function(combo, value) {
              this.test;
          }
      }
  }
  </code></pre>
  
  <p>And my custom function is that I have created after the closing of </p>
  
  <pre><code> this.callParent(arguments);
  </code></pre>
  
  <p>My custom function is </p>
  
  <pre><code>  test: function(){
          alert('test');
    }
  </code></pre>
  
  <p>What am I doing wrong?</p>