[Trinidad] tree or navigationTree for hierarchical menu

[Renzo Tomaselli]

Hi all, I successfully used tr:tree for representing tree-shaped data 
structures.
Now I need a hierarchical menu (to replace Tomahawk t:panelNavigation2), 
thus I'm a bit confused between tree and navigationTree.
Basically, using a tree would satisfy navigation requirements.
Why using navigationTree instead ?
Is anybody able to shortly englight the rationale behind this choice ?
Thanks -- Renzo