JustToQuestion

Hey all. I have been mapping a DM track, with shades and stuff. Thing is, I want some parts of the track to be "invisible". I know that I can set objects interior to 1 so the object becomes invisble but remains there, touchable, I mean part of the track. The bug I have is: I set interior to 1, I don't see the object when editing. But when I start testing, objects remain visible (interior is not working when playing the map). Can somebody tell me how to fix this? Sorry my english, tho.