[Zope] how to change Z Class Properity in Z Class method.

Hi, I create a class whth two dtml method: edit, edit_done. This class has one Properity "Title" edit contain: ------------------------------------------- <form action="edit_done"> Title:<input name=inputTitle value=<dtml-var Title>><p> <input type=submit> ------------------------------------------- and edit_done contain: ------------------------------------------- <dtml-call "manage_changeProperties(Title=inputTitle)"> ------------------------------------------- but the edit_done dtml method can't modify the properity of the object of that class. How to corroct this ? Thank you. Yuan-Chen Cheng.