('fill', 'cat', groupColor),
            new go.Panel('Vertical')
              .add(
                new go.Panel('Horizontal', { alignment: go.Spot.Left })
                  .add(
                    go.GraphObject.build('SubGraphExpanderButton'),
                    new go.TextBlock({ editable: true }).bindTwoWay('text')
                  ),
                new go.Placeholder({ padding: new go.Margin(0, 10) })
              )
          ),
        new go.Shape('LineH', {
          name: 'SHAPE',
         