I have litte difficulties with tree tag. [...] Any ideas what i might be doing wrong? Have I missed some important concurrency issue?

This won't work the way you're doing it... there are two options... 1. If you have a column in your table that is either a string,integer,or float, that unique identifies the row, then you can use the id attribute on the tree tag that allows you to specify an attribute of the object to use as unique ID of the tree element. (this should be a primary key type column). <dtml-tree foo id=columnA> 2. Otherwise, you'll need a pluggable brain that provides such an attribute. Chris -- | Christopher Petrilli Python Powered Digital Creations, Inc. | petrilli@digicool.com http://www.digicool.com