[Zope-CMF] portal_actions condition

[cla]

hello!

I want to add a condition in some portal_tab
that alows to show this or not,depending on
the user name that is logged.

I have tried to use the getUserName to make the
compares but seems that he dont recongize that method

this was my try:
(in the condition field) python: 'user-name'==portal.getUserName()




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