docs: function () {
                  var stateInfo = this._retrieveFromMemory();
                  var id = stateInfo ? stateInfo.state.id : null;
                  if (id && this._currentId != id && this._applyState(stateInfo)) {
                      this.state = this.getState();
                      this.$raiseEvent({
                          name : "popstate",
                          state : this.state
                      });
                  }
              }