title: KendoPanelBar PreventDefault
body: <p>I'm having problems understanding how preventDefault function works.
  I created a simple jsfiddle, but still, selections and expansion works and not prevented.</p>
  
  <p><a href="http://jsfiddle.net/XRfKb/15/" rel="nofollow">http://jsfiddle.net/XRfKb/15/</a></p>
  
  <p>Any help is appreciated, thanks.</p>
  
  <p>EDIT:
  How to prevent selection if page is not valid? Here's a piece of code:</p>
  
  <pre><code>panelBar.bind("select", function (e) {
     //some code here
     if (!isValid) {
              e.preventDefault(e); //doesn't work
              //this.select('#firstStep'); //doesn't work
          }
      });
  </code></pre>