var LayerClusterProperties = Class.create(LayerProperties,{
  getImage: function(location) {
    return location.icon;
  },

//  getIconSize: function() {
//    return new GSize(60,50);
//  },
//  getAnchor: function() {
//    return new GPoint(22, 50);
//  },
  markerCallBack: function (mapView,marker,location) {
    var clusterZoom = this.getZoomMax()+1;
    google.maps.event.addListener(marker,"click", function () {
      mapView.centerMap(marker.getPosition());
      mapView.setZoom( clusterZoom);
    });
  }
});