  Enables the event system for mouse events.
      </p><p>When set to true, the onPress, onRollOver and onRollOut events are broadcast.<br/>
   The event system is enabled or disabled for all faces of this object.<br/>
   As an alternative, you have the possibility to enable events only for specific faces.</p>
      <p>Once this feature is enabled, the animation is more CPU intensive.</p>
   
   <p>Example
   <code>
    var l_oShape:Shape3D = new Sphere("sphere");
    l_oShape.enableEvents = true;
    l_oSh