docs: function (propertyName, newValue, oldValue) {
              if (propertyName === 'currentValue') {
                  this.__setCurrentValue(newValue);
              } else if (propertyName === 'label' && this.showLabel) {
                  this.__setLabel(newValue);
              } else if (propertyName === 'maxValue') {
                  this._cfg.maxValue = newValue;
                  this._checkCfgConsistency();
              } else {
                  this.$Widget._onBoundPropertyChange.call(this, propertyName, newValue, oldValue);
              }
  
          }