No unit needed to buy hero

Hi there. Listen, i've finished my mod, but.. still i can't buy a hero from a building without a unit/hero.

i did put a circle of power, but.. it doesn't work!

any help?

Just make a unit that is exactly like a dummy caster but instead of no model make it the circle of power. If you don't want a circle of power just choose a different model.

never mind.
i've found the way. without units. it was easy. thankx