Need trigger help

Im trying to make a trigger that when someone walks to a region it will create a treant. But the problem is that I can create a treant everytime I walk over the region. So I need a away to stop the trigger from working again after the first time.

Try doing Action, Trigger - Turn Off as your last action.
This should cause the trigger to run only once.

Okay, thx I didnt realize that trigger there before.:D