rem: return row; 
add: treeitem.appendChild(row); return treeitem; 
context: function constructRow(treeCellChildren){    var row = document.createElement("treerow");    for (var i = 0; i<treeCellChildren.length; i++) {      var treecell = document.createElement("treecell");      treecell.appendChild(treeCellChildren[i]);      row.appendChild(treecell);    }    return row;}
meta: 9421	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/9421/b5da4da84fe8ff0b542668569d614e8077faab20/FilterEditor.js/buggy/mailnews/base/search/resources/content/FilterEditor.js