In a graphical modeling environment, bus signals, which group a plurality of signals together for simplifying a model, include a partial or complete physical definition. Said portions can be positioned at least in an operating position and in a folded position and define an interface having teeth for raising and lowering the base portion relative to the movable portion when they are rotated. The clip has a gripping section and the body has a gripping portion generally opposite the gripping section of the clip.