LandingManager::onDeleteLanding

static function onDeleteLanding(BitrixMainORMEvent $event)
{
	$landingId = $event->getParameter('primary');
	if($landingId > 0)
	{
		$pageList = PageTable::getList([
			'select' => ['ID'],
			'filter' => ['=LANDING_ID' => $landingId]
		]);
		while($page = $pageList->fetch())
		{
			PageTable::delete($page['ID']);
		}
	}

	return true;
}