(I speak frech, sorry for my english!) I created a ZClass, zRow. This class can contain other ZClass: zField_Text, zField_Date, etc. This let me define the columns contained in a zRow. I then defined a Class zTable, wich contains zRows. Question: - In my manage tabs, I needed a have a tab "Define columns". Do achieve this, I inserted a ZRow Instace (with id Definition) in my zTable product definition, and a method called Define_Columns, containing: <dtml-with Definition> <dtml-var manage_main> </dtml-with> And I defined a view "Define Columns" pointing to that method. When i click on the "Define Columns", I can see the manage screen of the instance "Definition", that's what I wantwd. But when Add a zField, the instance is create in the zTable level, not IN Definition instance! All the classes are Based on CatalogAware, ObjectManager. Any ideas how to fix that? Any sugestion how I could implement this? Jean-François Ménard Intranet DPAS Pratiques d'affaires et orientations * (514) 840-3000 poste 3939 * (514) 840-5585 * menard.jean-francois@hydro.qc.ca * 855 Ste-Catherine est, 6e étage Montréal, Qué. H2L 4P5