public function swapNode( $nodeID, $selectedNodeID, $nodeIdList = array() )
    {
        $contentObject1 = eZContentObject::fetchByNodeID( $nodeID );
        $contentObject2 = eZContentObject::fetchByNodeID( $selectedNodeID );
        $this->addObject( $contentObject1 );
        $this->addObject( $contentObject2 );
    }