[Zope] Change properties -> auto-update

[Gre7g Luterman]

I've created a product with a zClass that has a couple of property 
sheets.  Users can place this product in their web hierarchy and edit 
properties with the Properties tab.  This all works just fine.

The problem is that modifying one of the properties needs to have a 
side effect.  I would like to update a database if this property is 
changed.  Is there an easy way to hook into this process so I can set 
up a side-effect script?

The default propertysheets/Basic/manage page posts the results to 
propertysheet/Basic, but I'm fuzzy on how (or if) you can change the 
processing of this script.

I suppose I could replace the page that displays the properties and 
have it submit the changes to a custom script, but I'm not exactly 
crazy about that idea.  The downside of that route is that hardcoding 
the template page with one of my own will lose me the flexibility I 
have now.  If I add a new property, I'll have to remember to add it 
to the template.  Or does anyone know where I can find the current 
template that dynamically shows the property form, so I can make a 
modified version for this product?

Gre7g