Prevent panel from opening?

Prevent panel from opening?

I'm looking to try and have some logic built into one of my panels and am having trouble preventing it from opening.

I have the following code but it will not prevent the panel from opening.

  1. $(document).on('panelbeforeopen', '#right_panel', function(event){
  2.         event.preventDefault();
  3.         alert('test');
  4.         event.stopImmediatePropagation();
  5.         return false;
  6.     });