AutoCAD Architecture :: Convert Curtain Wall To A Wall?

I can convert a wall to a curtain wall but not a curtain wall to a wall. When converting a wall to a curtain wall I select wall in the design pallette right click apply to wall select the wall and it changes to a curtain wall. When I try converting a curtain wall to a wall I right click on curtain wall select apply properties to wall then go to select the curtain wall but I cannot select the curtain wall as a wall?

I simply want to convert an existing curtain wall to another wall type how is that done/