public function createSearch( $default = false )
	{
		if ( $default === true ) {
			$search = parent::_createSearch('locale.site');
		} else {
			$search = parent::createSearch();
		}

		$expr = array(
			$search->compare( '==', 'locale.site.level', 0 ),
			$search->getConditions(),
		);

		$search->setConditions( $search->combine( '&&', $expr ) );

		return $search;
	}