Zombie no modifications to objects in collision map.

(ENGLISH)
I made a modification on the map colorado, the Studio, and I put around this mini-city one zombie spawn. Only the zombies that are born there, they pass through objects.
How do collision between objects and zombies in new modifications :?: ?

(PORTUGUESE)
Fiz uma modificação no mapa colorado, pelo Studio, e botei em volta dessa mini-city um spawn de zombie. Só que os zombies que nascem lá, eles atravessam os objetos.
Como faço para haver colisão entre objetos e zombies em novas modificações :?: ?

Gameplay ---> Navigation, there just Build Nav Path, after that the screen frezze, after that you have a working Nav path (you must place regions, you can see the Nav Path Via that Blue Color on your screen.