private boolean trafficShown;
public TrafficOverlayDemo() {
Panel panel = new FlowPanel();
map = new MapWidget(LatLng.newInstance(40.652513, -73.936615), 12);
map.setSize("640px", "480px");
panel.add(map);
Button toggleTraffic = new Button("Toggle Traffic");
toggleTraffic.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {