final VerticalPanel panel = new VerticalPanel();
final InfoWindowContent content = new InfoWindowContent(panel);
panel.add(new Label("LatLng: " + event.getLatLng().toString()));
// Do a reverse geocode of this position
geocoder.getLocations(event.getLatLng(), new LocationCallback() {
public void onFailure(int statusCode) {
Window.alert("Failed to geocode position " + event.getLatLng()
+ ". Status: " + statusCode + " "
+ StatusCodes.getName(statusCode));