docs: function (propertyName, newValue) {
              if (!this._cfg) {
                  return;
              }
              if (propertyName === "items" && this._cfg.bind.hasOwnProperty(propertyName)) {
                  var oldValue = this.getProperty(propertyName);
                  this._cfg[propertyName] = newValue;
                  this._onBoundPropertyChange(propertyName, newValue, oldValue);
              } else {
                  this.$TemplateBasedWidget.setWidgetProperty.apply(this, arguments);
              }
          }