ublaboo / datagrid

	 */

	public function getActiveRowProperty(ActiveRow $item, $key)

	{

		if (preg_match("/^:([a-zA-Z0-9_$]+)\.([a-zA-Z0-9_$]+)(:([a-zA-Z0-9_$]+))?$/", $key, $matches)) {

			$relatedTable = $matches[1];

			$relatedColumn = $matches[2];

			$throughColumn = isset($matches[4]) ? $matches[4] : NULL;

			$relatedRow = $item->related($relatedTable, $throughColumn)->fetch();

			return $relatedRow ? $relatedRow->{$relatedColumn} : NULL;

		}

		if (preg_match("/^([a-zA-Z0-9_$]+)\.([a-zA-Z0-9_$]+)(:([a-zA-Z0-9_$]+))?$/", $key, $matches)) {

			$referencedTable = $matches[1];

			return $relatedRow ? $relatedRow->{$relatedColumn} : NULL;

		}

		if (preg_match("/^([a-zA-Z0-9_$]+)\.([a-zA-Z0-9_$]+)(:([a-zA-Z0-9_$]+))?$/", $key, $matches)) {

			$referencedTable = $matches[1];

			$referencedColumn = $matches[2];

			$throughColumn = isset($matches[4]) ? $matches[4] : NULL;

			$referencedRow = $item->ref($referencedTable, $throughColumn);

			return $referencedRow ? $referencedRow->{$referencedColumn} : NULL;

		}

		return $item->{$key};

	}