[Twisted-web] formless problem

[Tazzo]

I wrote this simple app, where the RootPage has only a single
child, named \'form\'. This child \'FormBuilder\' is directly taken from
formbuilder.py in the example directory of last svn Nevow.
The child is correctly rendered but when I try to add an element
to the form, it doesn\'t appear (the formbuilder example work well
if a try the Nevow example). 

Any help?

############################
###  Root Page
############################
from nevow import loaders
from nevow import rend
from nevow import tags as T
from nevow.stan import directive
from formbuilder import FormBuilder
class RootPage(rend.Page):
    addSlash = True
    docFactory = loaders.stan( T.html [ T.body [ T.a ( href=\'form\' ) [
\'form page\' ] ] ] )
    
    def child_form(self, ctx):
        return FormBuilder()
############################ 
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