code: function configureEvents(dispatch, options){
                          if (dispatch && options){
                              angular.forEach(dispatch, function(value, key){
                                  if (options[key] === undefined || options[key] === null){
                                      if (scope._config.extended) options[key] = value.on;
                                  }
                                  else dispatch.on(key + '._', options[key]);
                              });
                          }
                      }
docs: Subscribe to the chart events (contained in 'dispatch') and pass eventHandler functions in the 'options' parameter