rem: database.AddDataSource(accountManagerDataSource); 
add:  accountManagerDataSource = accountManagerDataSource.QueryInterface(Components.interfaces.nsIRDFDataSource); folderDataSource = folderDataSource.QueryInterface(Components.interfaces.nsIRDFDataSource); var database = GetFolderDatasource();  database.AddDataSource(accountManagerDataSource); 
context: function OnLoadFolderPane(folderTree){    gFolderTree = folderTree;	SortFolderPane('FolderColumn', 'http://home.netscape.com/NC-rdf#FolderTreeName');	//Add folderDataSource and accountManagerDataSource to folderPane	accountManagerDataSource = accountManagerDataSource.QueryInterface(Components.interfaces.nsIRDFDataSource);	folderDataSource = folderDataSource.QueryInterface(Components.interfaces.nsIRDFDataSource);	var database = GetFolderDatasource();	database.AddDataSource(accountManagerDataSource);    database.AddDataSource(folderDataSource);	folderTree.setAttribute('ref', 'msgaccounts:/');}
meta: 10234	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/10234/1e0e99191d9d4f4f04fb4061b0ba91f347b8986f/msgMail3PaneWindow.js/buggy/mailnews/base/resources/content/msgMail3PaneWindow.js