When someone clicks on active area, how do I stop the default event from firing?

Question: in scheduler, for onBeforeEventRender, I add an active area with an onClick. How do I stop the onEventClick from the event from firing? If they click on the event area, there's no need to execute the event's onEventClick handler.

Thanks,
Doug

// Some of the code  (I can't figure out how to post code on here)

dp.onEventClick = function(args) {
  editBlock(args.e.id(), false);
};

dp.onBeforeEventRender = function(args) {
  args.data.areas = [
    {
      top: 7,
      right: 0,
      bottom: 9,
      width: 17,
      height: 17,
      onClick: function(args) {
        var areaObj;
        jQuery("#delete_block_dialog" ).dialog({
          // some dialog code here
        });
        return false;
      },
      visibility: "Visible",
      css: "fa fa-times delete_calendar_event"
    }
  ];
};
// etc.