Is there a way to lock individual walls? I'm trying to resize rooms from a image I imported. However, when I move a wall to resize it changes other rooms. I want to lock each room's walls as I resize. For example, when I resize the Master Bathroom (23') it also resizes the Master Bedroom (after I've already resized it from 14' 8" to 16') It changes the Master Bedroom back to 14' 8"..