No Jessica,
I mean the actual control column and such. The wing spars moved, the control column arrangement changed to suit this. The D.I & D.II had two main wing spars in the lower wing, the cables ran behind the rear one. The D.III only had one lower wing spar further forward as the D.V & D.Va that followed. It's just assumed by many that the change to control column came with the new fuselage of the D.V.
Kolomans D.III Controls mid build to show.
Hopefully this link works. new image storage site for me. Tired of Photobucket messing with things.
Keith