Element::getGridColumnsDescription

protected function getGridColumnsDescription()
{
	$result = array_merge(
		parent::getGridColumnsDescription(),
		$this->getElementFieldsDescription()
	);

	$result = array_merge(
		$result,
		$this->getProductFieldsDescription()
	);

	$properties = $this->getElementPropertiesDescription();
	if (!empty($properties))
		$result = array_merge($result, $properties);
	unset($properties);

	return $result;
}