How to use SteamVR script with my own 3D objects?

Hi!

I am trying to use the scripts "Interactable" and "Throwable" with my imported models but nothing happens, not even the yellow border that tells me that the script "Interacable" would work.

When I use them with a cube that is created inside Unity it all works like a charm.

I have created the models in Maya, exported them as .FBX and then imported them into Unity. I have tried to put a box collider on the model but nothing happens.

Any ideas out there?
//Liv