Centering of title of group

@nvcc wrote:

I'm using one of your sample with some changes:

diagram.initialContentAlignment = go.Spot.Center;
diagram.groupTemplate =
  $(go.Group, "Auto",
    $(go.Shape, "Rectangle",
      { fill: "gold" }),
    $(go.Panel, "Vertical",
      { margin: 5,   defaultAlignment: go.Spot.Left },
    $(go.Panel, "Table",
      { alignment: go.Spot.Top, stretch: go.GraphObject.Fill, background: "#fceed1" },
    $(go.RowColumnDefinition, { column: 0, width: 16 }),
      $("SubGraphExpanderButton",
        { row: 0, column: 0, margin: new go.Margin(0, 0, 0, 3)
         }),
      $(go.TextBlock, {row: 0, column: 1, font: "14px Sans-Serif", margin: new go.Margin(4, 20, 4, -12), stroke: "#a8863b"}, "Center me!")
    ),
    $(go.Placeholder,  { padding: 10 })
  )
);

diagram.model = new go.GraphLinksModel(
 [ { key: 0, isGroup: true },
    { key: 1, group: 0 },
    { key: 2, group: 0 },
    { key: 3, group: 0 } ] );

That's how I've reached centering of the title. And it works. But if I add placeholder to make it a little bit prettier

$(go.Placeholder, { padding: 10 })

It breaks. When I collapse group, group takes place only for this padding and hides the title.

Is it a bug? And more general question is how can I center the title and keep it centered in both collapsed and expanded states of the group?

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