How to use addAdornment?

@marin wrote:

I've tried to use the addAdornment function to programatically add an adornment to a node. This is the adornment template:

$(go.Adornment, 'Auto',
        {
            layerName: "Background",
            selectable: false,
            isInDocumentBounds: false,
            desiredSize: new go.Size(400, 400)
        },
        $(go.Shape, "Circle",
            {
                fill: $(go.Brush, "Radial", {0.0: "blue", 1.0: "white"}),
                stroke: null
            }),
        $(go.Placeholder)//, {alignment: go.Spot.Center, alignmentFocus: go.Spot.Center})
    );

However, I get an exception. As far as I can tell, the exception is caused by: $(go.Placeholder).
This is the exception: TypeError: Cannot read property 'fb' of null
When I remove the placeholder, no exception is thrown, but also no adornment is visible.

AddAdornment is called inside a transaction.

What am I doing wrong?

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