* @since 5.0.0
*/
public void service(org.zkoss.zk.au.AuRequest request, boolean everError) {
final String cmd = request.getCommand();
if (cmd.equals("onCenterChange")) {
final CenterChangeEvent evt = CenterChangeEvent.getCenterChangeEvent(request);
_center = evt.getCenter();
Events.postEvent(evt);
} else if (cmd.equals("onRadiusChange")) {
final Map data = request.getData();
_radius = ((Number)data.get("radius")).doubleValue();
Events.postEvent(new Event("onRadiusChange", this, data));