how to make a physical object pass through another

I have one falling physical object and I want it to pass through another physical one sometimes. I tried to disable collisions, but it stills bounce on it.

Yeah I'm having issues with that too, especially when that's two instances of the same object

Actually I would love a global "Disable physics collision" action (with everything), is it a limitation of Box2d that it only happens with a specified object for the moment?

Tried to solve: dl.dropbox.com/u/66358591/physics_collision.capx

ps. click couple of times on 'mode change" text, I messed something up with it a little bit

Thanks, I finally understood what to do. Can't believe I didn't in the first place, it was so simple! xD