[z3-five] ${portal_url} not resolved in ZCML

[Dennis Schulz]

Hi,

I tried

<browser:menu
   title="user"
   id="user"
   />

<browser:menuItem
   for="*"
   menu="user"
   title="Manage Hours"
   action="${portal_url}/multiplehours.html"
   permission="zope2.View"
   />


source: 
http://www.serverzen.net/weblog/archive/2006/01/07/cmf-with-zope-3-on-zope-2

${portal_url} cound not be resolved as I tried it
(Plone 2.5.1, five 1.4.1)
What do I have to do to have a the menu item inside the Plone Instance 
for example in a folder like intranet/MApplication?


Thanks, Dennis