[Zope] title of a property sheet?

I'm working with a ZClass and I need to get the titles of my property sheets. One would think that for item in container.propertysheets.values(): print item.title would work, since title is just an attribute defined in __init__, but that produces nothing at all. I've dug around in the code, but can't seem to find out otherwise. Any help is appreciated. Clearly it's available, as title shows up in the management pages. Thanks, -- John Coleman jcoleman@sbc.edu