code: function (propertyName) {
      if (this.isObjectBased) {
        if (!(propertyName in this.attrValue)) { return; }
        delete this.attrValue[propertyName];
        this.data[propertyName] = this.schema[propertyName].default;
      } else {
        this.attrValue = this.schema.default;
        this.data = this.schema.default;
      }
      this.updateProperties(this.attrValue);
    }
docs: Reset value of a property to the property's default value.
  If single-prop component, reset value to component's default value.
  
  @param {string} propertyName - Name of property to reset.