Hi all, I'm newbie both in python and in zope (in English too!), and here is a problem I realy can't sort out. I would to display the tree structure of a repository disk. Therefore I wrote a recursive class MyFolder, with the following attributes (code is at the bottom of the message): class MyFolder: fname : name of the base folder subfolders : a list of MyFolder objects, made after the subfolders of my folder MyFiles : a list of the files of my folder (actually a list of object whose only attribute is the name of the file) I call this class with the following external method: def ZMyWalk(self,dir): #=None): """ returns ...""" # MyRepTest is the default value #if not dir : dir=MyRepTest return MyFolder(dir) And I try to publish it with the following DTML-method: <dtml-with "ZMyWalk('\\\\saigon\\d\\divers\\wlk')"> <dtml-tree branches_expr=subfolders> <dtml-var FolderName> <dtml-in MyFiles> <dtml-var name><br> </dtml-in> </dtml-tree> </dtml-with> It displays the first level fine. But when I try to expand the tree by clicking on the small + sign, it acts randomly (doesn't do anything, or expand another branch, sometimes it even does the right thing, ..). Any guess? I'm totally lost :-( . I'm not sure I does this the right way. The SomeFile class I 've made seem rather artificial. I run Zope 2.1.6 with Python 1.5.2 under NT4.0 and I got the TreeTag.py pach. PS : here are the classes I use. class MyFolder: """fait une recursion dans un repertoire""" def __init__(self,dir): self.path=dir self.FolderName=os.path.basename(dir) self.subfolders=[] self.MyFiles=[] for f in os.listdir(dir): pathname='%s\\%s' % (dir, f) if os.path.isdir(pathname): self.subfolders.append(MyFolder(pathname)) elif os.path.isfile(pathname): self.MyFiles.append(SomeFile(f)) else: pass class SomeFile: """ ... """ def __init__(self,name): self.name=name