code: function() {
              if(this.enableChartClick) {
                  var self = this;
  
                  $.extend(true, this.hcConfig, {
                      plotOptions: {
                          series: {
                              point: {
                                  events: {
                                      click: function(event) {
                                          self.onPointClick.call(self, this, event);
                                      }
                                  }
                              }
                          }
                      }
                  });
              }
          }
docs: ////////////////////////////////////////////////////////////////////////// helper methods for attaching event handlers