[Zope] Disabling/Post-processing Copy-Paste

I want to give a collection of objects a unique value for each, stored in a property. Problem is, copying and pasting a object would leave me with two objects with the same value. Is it possible to: A. Disable only Copy and not Cut? or B. Have a object (a ZClass instance, actually) do something automatically when it gets created by a Paste? -- Itamar - itamars@ibm.net ---------------------------o----------------------------------------------o Perl/Gimp Greeting Cards | Trust? Ha! The US dollar is backed by ICBMs! | http://www.sealingwax.com | --Anonymous Coward, Slashdot |