Changing basic tile type

[Zyx]

Is there a way to change to basic tile type when there are objects on the cell?
Here's my problem: I have a champion portrait on a TRICK wall. CSBuild doesn't recognize this as a portrait. It only tells me "Not implemented". So I try to put a real wall instead in order to make my changes correctly.
I would also have to change the wall to a floor to check what would happen if the party enter the cell. Then at last I would put a trick wall again.

This manipulation is necessary for all the trick walls when one wishes to put an actuator in it: one has to check what the actuator would be as a floor actuator and as a wall actuator.

[Paul Stevens]

Well, I played it a bit safe when first writing
CSBuild. The problem was that some things
depend on the tile type. So I just took the
safest route.

So we have to study each case to see what
can be done. Here you want to put a portrait
ion a trick wall. I wiill look into that particular
case. If all is well I will allow a portrait there.