Triggering help

[Godly-Forces]

I need a trigger so that when the game starts you can see something but then when you do something you cant...

This is the trigger i am using now:

Event - A unit enters playable map area

Condition - Owner of last created unit equal to player 1 red

Action - Disable last created visiblity modifier

what is wrong with that if there is anything??

 

[lorothrigs]

1. If the event is unit Enters wouldnt the condition be entering unit?
2. WHen was the visblility modifier created? If never then Last Created Modifier region wouldnt work.