I just tried a part in the M020 build of Creo 2.0 that contained both solid and surface geometry. The surface layer was off and saved with that status. I picked the part in the model tree, then changed the filter to Component, then changed the filter to Solid Geom, and lastly used pre-selection highlighting to select the solid geometry. In all cases when I picked my draft plane it only checked the solid geometry. Not sure why the surfaces are being picked.