protected function executeChild(CommandInterface $command, $name = null)
{
$name = $name ?: static::guessEventName($child);
$event = new CommandEvent($name, $command);
$this->getEventManager()->attach($name, function (CommandEvent $event) {
$result = $event->getTarget()->execute();
$event->setResult($result);
});
$this->getEventManager()->trigger($event);
return $event->getResult();
}
