[Zope] How to limit types of classes added to a Folder

[Russell Fine]

I'm building a class (Site) that contains a Folder (Called screenshots) in which I will be storing instances of a class I've built called ScreenShot.  The problem is that I can't figure out how to make the Folder interface in the ZMI limit the instance types to ScreenShot.  In the Site class __init__ method, I have :
 
        OFS.Folder.manage_addFolder(self, 'screenshots', 'Screen Shots')
        self.screenshots.meta_types=('ScreenShot')

However, this isn't working.  I looked into the Folder class, and discovered that it's base class ObjectManager has a class property (not instance) called meta-types that is a tuple.  do I need to sub-class Folder and set meta_types at the class level ?  
 
Russell Fine
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