code: function(options) {
          OpenLayers.Layer.Grid.prototype.initialize.apply(
              this, [options.name, options.url, {}, options]
          );
          this.tileOptions = OpenLayers.Util.extend({
              utfgridResolution: this.utfgridResolution
          }, this.tileOptions);
      }
docs: Constructor: OpenLayers.Layer.UTFGrid
  Create a new UTFGrid layer.
  
  Parameters:
  config - {Object} Configuration properties for the layer.
  
  Required configuration properties:
  url - {String} The url template for UTFGrid tiles.  See the <url> property.