[Twisted-web] deferred as resource

When I try to return a resource (instance of a subclass of Renderer) as a deferred in nevow I get the following message: ....\twisted\python\components.py", line 77, in __call__ raise CannotAdapt("%s cannot be adapted to %s." % twisted.python.components.CannotAdapt: <Deferred at 0xc9a508> cannot be adapted to <class 'nevow.iwoven.INewResource'>. Is there a workaround for this problem? I need to make calls to a perspective broker, so I get deferreds back. I am using Python 2.3.3, twisted 1.1.1 and the nevow cvs from today. Thanks Mike