Hey guys, does anyone happen to know how to work the rally unit field in the Create Unit effect?

I want to make a persistent unit spawner, kind of like the Swarm Host.

So I made a behavior that activates every 60 seconds to create 1 zealot at the location of the building, I would then like this zealot to attack to the location of the building's rally point

When I set the rally unit to the caster, it simply spawns the zealot at the rally point of the building, rather than at the building. Anyone know how to make it spawn at the building then rally to the point?

it seems like the "rally unit" is overriding the target location, is this a bug?
Edited by Echo on 4/3/2013 8:16 PM PDT