[Zope-CMF] getattr misbehaving

[seb bacon]

I've got an extremely wierd problem here, tho it may not be CMF-specific.  
I'm overriding __call__ to return a method dynamically in some 
PortalContent, like this: 

    def __call__(self, client=None, REQUEST={}, RESPONSE=None, **kw):
        _method = self.callMethod
        print _method
        # prints 'edit_view'
        return getattr(self,_method)(self, REQUEST)

that doesn't work, even though _method is returning the correct string.
instead it returns the 'view' method.  However, when I do this:

    def __call__(self, client=None, REQUEST={}, RESPONSE=None, **kw):
        _method = 'edit_view'
        print _method
	# prints 'edit_view'
        return getattr(self,_method)(self, REQUEST)

it works :S

What's going on?  (I'm sure there must be a better way to do this, 
anyway...:)

seb