text: U.Style.Circle = U.Style.Image.extend({
      init: function (options) {
          var opts = options || {};
  
          this.fill = opts.fill !== undefined ? opts.fill : new U.Style.Fill({color: "#FFFFFF"});
          this.stroke = opts.stroke !== undefined ? opts.stroke : new U.Style.Stroke({color: "#000000"});
          this.radius = opts.radius !== undefined ? opts.radius : 2;
      }
  })