How to trigger an actor based on his location in the scene?

FPGames

Im doing a portrait game almost like doodle jump i have many actors that have timers,others that have accelerate behaviors.The problem is that when i click preview all the actors just start their behaviors right away and that affect all the game.I want just to make them start when the scene show them so everything goes right in the game.the position of one actor is x=251 and y=283.

Braydon_SFX

So make a rule:

When ALL:
self.position x > 251
self.position y > 283

Do behaviors...

FPGames

Can yo give me a example.