}
break;
case POLYGON_VISIBILITY_CHANGED_HANDLER: {
final PolygonVisibilityChangedHandler h = new PolygonVisibilityChangedHandler() {
public void onVisibilityChanged(PolygonVisibilityChangedEvent e) {
textBox.setText(textBox.getText() + "onVisibilityChanged("
+ e.isVisible() + ")");
}