public function setSiteId( $id )
	{
		if ( $id === $this->getSiteId() ) { return; }

		$this->_values['siteid'] = (int) $id;
		$this->_sitePath = array( (int) $id );
		$this->_siteSubTree = array( (int) $id );

		/** @todo: Wrong site item shouldn't be available any more but causes problems in controller */
		// $this->_site = null;

		$this->setModified();
	}