public function getItem( $id, array $ref = array() )
	{
		if( ( $value = $this->getCache()->get( $id ) ) === null ) {
			throw new MAdmin_Cache_Exception( sprintf( 'Item with ID "%1$s" not found', $id ) );
		}

		return $this->_createItem( array( 'id' => $id, 'value' => $value ) );
	}