Trees in Tabs?

In pre-planning a XUL utility (for personal use), I hit on the idea of
having multiple tabs with trees in that are populated by Javascript.
Before I start my coding, I'd like to know is this possible?  If so,
is there anything special beyond building it like

<tab>
      <tree>
            ...stuff in tree...
      </tree>
</tab>

Any real gotcha's to look out for?

Thanks in advance...