[Zope-dev] Does anyone know how to suppress display of +/- signs on a dtml-tree?

[Craeg K. Strong]

Hello:

I want to display a dtml-tree always expanded, with no controls visible
for contracting (basically, an indented list of links).
I set the tree to always expand via the following:

<dtml-call expr="REQUEST.set('expand_all', 1)">

<dtml-tree single=0 name="catalog" branches="objectValues">

But I can't figure out how to remove the little minus signs (-) from the 
branches.

Has anyone done this?  

TIA,

--Craeg