[Solved] How to limit training of new custom Heroes to 1?

I'm trying to add more custom heroes to each race in a melee map but don't know how to limit the Hero to 1 per type. I looked and tried everything but can't seem to fix this problem. Anyone know how to limit training of new heroes to 1 per player? Thanks in advance.

Trigger Editor.
Create a new trigger.

Events: Map Initialisation
Conditions:
Actions:
For Loop from 1 to PlayerCount
Then-Actions
Player - Limit Traiding of Heroes to 1 for Player[IndexA]
Else-Actions

Look in Advanced>Gameplay Constants>Techtree Equivalents - Hero
And add all your custom heroes there.

Thanks guys... I appreciate the help.