[Zope] - tree tag questions

[Michael Bernstein]

I have two questions regarding the tree tag:

1) How do I force the tree to only display the branches I want?
specifically I want to eliminate the 'Control_Panel' and 'acl_users'
branches.

2) How do I force the tree to render in the context of the particular
directory? I'm including it through a document called 'sidebar' in the
root, and although I want it to be acquired throughout the site, I would
like it to display the entire tree, and not just the branches below the
current document location.

Thanks,

Michael Bernstein.