Hi Stoyan,
I use the following code to append a label under a ShapeNode.

    ShapeNode node = diagram.Factory.CreateShapeNode(40, 40, 80, 40);
     node.EnabledHandles = AdjustmentHandles.Move;
    node.Shape = Shape.FromId("...");
     ShapeNode labelNode = Canvas.Factory.CreateShapeNode(0, 80, 80, 20);
        labelNode.AttachTo(node, AttachToNode.BottomCenter);
     labelNode.Locked = true;
     labelNode.Text = "Label";
     labelNode.Transparent = true;
     node.SubordinateGroup.AutoDeleteItems = true;
        node.SubordinateGroup.FollowMasterContainment = true;

When I define a Layout and call the Arrange method, the labe node is regarded as a normal ShapeNode and is separated from the master node.
        LayeredLayout layout = new LayeredLayout();
        // Perform the actual arrangement
        layout.Arrange(diagram);

Is it a bug for Layout?

Thanks a lot!

Thanks Stoyan.

Merry Christmas and happy new year!