code: function(options) {
        options = options || { };
  
        this.callSuper('initialize', options);
  
        this.set('rx', options.rx || 0);
        this.set('ry', options.ry || 0);
  
        this.set('width', this.get('rx') * 2);
        this.set('height', this.get('ry') * 2);
      }
docs: Constructor
  @method initialize
  @param {Object} [options] Options object
  @return {Object} thisArg