Does anybody have a clue as to why Design Layer Viewports return a type of "86" (Plug-in Object)? I am looking for a way to control the layer and class visibility inside design layer viewports using VS. But since they don't return a correct type, the following functions won't work: GetVPLayerVisibility SetVPLayerVisibility GetVPClassVisibility SetVPClassVisibility etc. etc. Any tricks? Thanks! V-G.