hmmmm. I didn't know that. I guess they are post rendered or designed to be volumetric, as in the case. (so makes sense) Sorry for the misinformation then fran, kinda new myself. However, try using the 4 view pane in the assembly room this will help you see all sides of your scene. Perspectives can throw you at times.

No need to think outside the box....
    Just make it invisible.