indObject('SCALE');
                          var path = scale.findMainElement();
                          var len =
                            ((v - scale.graduatedMin) /
                              (scale.graduatedMax - scale.graduatedMin)) *
                            path.geometry.bounds.height;
                          return new go.Size(10, len);
                        }),
                      commonSlider(true)
                    )
                ),
              // state information
      