}
break;
case POLYLINE_VISIBILITY_CHANGED_HANDLER: {
final PolylineVisibilityChangedHandler h = new PolylineVisibilityChangedHandler() {
public void onVisibilityChanged(PolylineVisibilityChangedEvent e) {
textBox.setText(textBox.getText() + "onVisibilityChanged("
+ e.isVisible() + ")");
}