function wfAddSidebarTree( $out, $skin ) {
        global $wgUser, $wgParser;
        $opt = ParserOptions::newFromUser( $wgUser );
        $title = Title::newFromText( 'Sidebar', NS_MEDIAWIKI );
        $article = new Article( $title );
        $html = $wgParser->parse( $article->fetchContent(), $title, $opt, true, true )->getText();
    if($wgUser->isLoggedIn()){
        $out->addHTML( "<div id=\"wikitext-sidebar\">$html</div>" );
    }
        return true;
}