[Zope] dtml-tree name

[Marie ROBICHON]

I would like to define the name attribute of the dtml-tree widget with a 
string returned by a script (called treename) but I'm not sure of the syntax.

<dtml-tree expr="<dtml-var treename>" branches="tpValues"> doesn't work nor 
does
<dtml-tree name="<dtml-var treename>" branches="tpValues"> nor
<dtml-tree treename branches="tpValues">

Any ideas anyone?

TIA

Marie Robichon
Web Task Force
European Synchrotron Radiation Facility
Grenoble
France