[Zope] Cut,Copy and Paste with own ZClass

Hello! I have created a new Product with my own ZClass to define my own type of folder. This ZClass has "ZObject" and "ZFolder" as base classes. Everything is working great but I can´t do "Cut, Copy, Paste or Rename" with instances of these ZClass. What is the problem. ZOPE says "The object xyz does not support this operation". What can I do? Steffen