function getOnDeleteProps($cascading) {
		$result = array();
		$clsDes = $this->getClassDescriptor();
		$props = $clsDes->getMultiValuePropertyDescriptors();
		forEach ($props as $propName => $prop) 
			if ($prop->getOnDelete()) 
				$result[$propName] = $props[$propName];
		return $result;
	}