*
* @param handler the handler
* @return {@link HandlerRegistration}
*/
public HandlerRegistration addContainerHandler(ContainerHandler handler) {
GroupingHandlerRegistration reg = new GroupingHandlerRegistration();
reg.add(addHandler(handler, BeforeAddEvent.getType()));
reg.add(addHandler(handler, BeforeRemoveEvent.getType()));
reg.add(addHandler(handler, AddEvent.getType()));
reg.add(addHandler(handler, RemoveEvent.getType()));
return reg;
}