[ZPT] Adding to namespace stack in ZPT

[Jay, Dylan]

This one is getting me fustrated. I want to call some DTMLMethods from a
template perhaps with a database result in the context (ie at the top of the
namespace stack). Although I can call DTML from ZPT I can't seem to place
things in the namespace stack, ZPT just uses its own namespace. For instance

<dtml-with "qryA()[0]">
 <dtml-call showRow>
</dtml-with>

How do I replace that (without rewriting showRow?