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: 8395	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8395/d0528c22049a7265c10662c174bd5ebea271be62/FilterEditor.js/clean/mailnews/base/search/resources/content/FilterEditor.js