OK guys - here's the problem.... I have a number of ZClasses, each one has a title property that is actually a function and pulls information from other properties of the ZClass. I want to use this property to sort my tree object. So being the python genius that I am not - I have created a python script to return the branches in the correct order sorted by title. # This is the code that returns objects for the tree view con=context return_object=[] for obj in con.objectValues(['Folder','Group', 'Project', 'Micrograph', 'Microscopy', 'Scan', 'Purification', 'Aliquot', 'Freezing', 'Progress', 'Publication', 'Reference', 'Reconstruction', 'Structure', 'CCD']): return_object.append(obj) return_object.sort(lambda a,b:a.title<b.title) return return_object However, this code does not evaluate the title - but simply returns the dtml-if statement and sorts on that.... not what I want! Any ideas? Laurie Laurie Nason Baylor College of Medicine Houston TX USA