Link Location in Tree Layout

@Tany wrote:

Hi,
My Diagram has Tree Layout with the following attributes :
this.diagram.layout = this.GO(go.TreeLayout,
{ angle: 90, nodeSpacing: 10, layerSpacing: 40, layerStyle: go.TreeLayout.LayerUniform, alignment: go.TreeLayout.AlignmentCenterChildren, childPortSpot : go.Spot.TopCenter } );

Some of the child nodes are groups.
When a group is collapsed, the link from the parent node to the group node is located on the left side of the group, as shown in the picture :

closedGroup.jpg1152x648 41.3 KB

When the group is expanded, the link is located on top of the group, as shown in the picture :

OpenedGroup.jpg1152x648 36.4 KB

I would like the link to be always connected on the top of the group.
How can i force it ?

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