code: function (e) {
  
      e.returnValue = false;
  
      if (e.preventDefault) {
  
        e.preventDefault();
      }
  
      if (!me.enableEventPropagation_) {
  
        cancelHandler(e);
      }
    }
docs: This handler ignores the current event in the InfoBox and conditionally prevents the event from being passed on to the map. It is used for the contextmenu event.