* @param handler the handler to call when this event fires.
*/
public void addPolylineClickHandler(final PolylineClickHandler handler) {
maybeInitPolylineClickHandlers();
polylineClickHandlers.addHandler(handler, new LatLngCallback() {
@Override
public void callback(LatLng latlng) {
PolylineClickEvent e = new PolylineClickEvent(Polyline.this, latlng);
handler.onClick(e);
}