Code

...
        for()
        {
                ContainerNode cn = diagram.Factory.CreateContainerNode(10, 10, 40, 40);
                cn.Caption = id;
                cn.AutoShrink = true;
                cn.Brush = new MindFusion.Drawing.SolidBrush(Color.FromArgb(32, 0, 0, 0));
                cn.ShadowBrush = null;
                diagram.Nodes.Add(cn);
...
                for()
                {
                  ShapeNode icn = new ShapeNode(diagram);
                  cn.Add(icn);
                }
        }

...
            foreach (DiagramNode dn in diagram.Nodes)
            {
                if (dn is ContainerNode)
                {
                    ContainerNode cn = (ContainerNode)dn;
                    foreach (DiagramNode dnn in cn.SubordinateGroup.AttachedNodes)
                    {
                        dnn.ZTop();
                    }
                }
            }
...