LatLng[] points = {a, b, c, d, a};
Polyline line = new Polyline(points);
_mapManager.addOverlay(line, 10, 20);
Marker marker = new Marker(b);
marker.addMarkerClickHandler(new MarkerClickHandler() {
public void onClick(MarkerClickEvent event) {
System.out.println(lb.getMinLat() + " " + lb.getMinLon());
System.out.println(lb.getMaxLat() + " " + lb.getMaxLon());
}
});