How to change the pink selection box?

@sean-hill wrote:

How do I change the color of the pink box and blue arrow here?

I have tried this code:

diagram.toolManager.dragSelectingTool.box =
    $make(go.Part, { layerName: 'Tool', selectable: false },
        $make(go.Shape, { name: 'SHAPE', fill: null, stroke: 'red', strokeWidth: 2 })
    );

But it has not worked. Thanks for any help you can provide!

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