Make a ladder

I'm trying to make a ladder in torque engine. I tried with a trigger and when I'm the trigger I change z and s to go Up en Down, and Nothing. Then, I've made a physical Zone with the gravity to 0; nothing...

I work on a 1.1.2 Torque release.

Do you have a solution to make ladders ?

In the others games the player get a flying state like the camera, we should go in this direction perhaps ...

Thanks per advance.