If I select bedroom wall and insert a door, I would think the door 'belongs' to the bedroom. The 'Object Count' displays all the rooms, but it appears the door to the bedroom is counted under 'bedroom' as well as 'hallway'. Also, the room 'Garage' does not show up as a room as a column header. I added two hinged doors to the garage, these doors are not showing up since there is no column labelled as 'garage'.
