code: function (type, create) {
              var self = this, customEvent, customEventObservables = self.getCustomEvents();
              customEvent = customEventObservables && customEventObservables[type];
              if (!customEvent && create) {
                  customEvent = customEventObservables[type] = new CustomEventObservable({
                      currentTarget: self,
                      type: type
                  });
              }
              return customEvent;
          }
docs: Get custom event for specified event
  @private
  @param {String} type event type
  @param {Boolean} [create] whether create custom event on fly
  @return {KISSY.Event.CustomEvent.CustomEventObservable}