docs: function (event, delegateId, wrapTarget, container) {
              this.$assert(286, this.__delegateMapping);
              var eventWrapper = this.__wrapEvent(event, wrapTarget), result;
              var callback = this.__delegateMapping[delegateId];
              if (callback) {
                  result = callback.call(eventWrapper);
              }
              eventWrapper.$dispose();
              return result;
          }