docs: function (cb, evt) {
              if (this._syncLoadCounter < this.MAX_LOAD_STACK) {
                  this._syncLoadCounter++;
                  this.$callback(cb, evt);
                  this._syncLoadCounter--;
              } else {
                  var self = this;
                  Aria.$global.setTimeout(function () {
                      self.$callback(cb, evt);
                      self = cb = evt = null;
                  }, 0);
              }
          }