I am creating custom container using createContainerNode. it contains 4 Shape node. As you can see in below pic.

In our diagram we are having many custom nodes to show. I need to use tree layout for our custom node but not able to layout it properly please the pic below

My Code for layout :
private rearrangeDiagram(diagram: any) {
        //Apply Layout
        if (diagram != undefined) {
            var layout = new MindFusion.Graphs.TreeLayout();

            if (this.layoutDirection != undefined) {
                layout.direction = this.layoutDirection.toLowerCase().trim().toString() == "horizontal" ? MindFusion.Graphs.LayoutDirection.LeftToRight : MindFusion.Graphs.LayoutDirection.TopToBottom ;
            } else {
                //default is TopToBottom
                layout.direction = MindFusion.Graphs.LayoutDirection.TopToBottom;
            }

            layout.linkType = MindFusion.Graphs.TreeLayoutLinkType.Cascading;
            layout.levelDistance = 25;
            layout.nodeDistance = 20;
            diagram.arrange(layout);
            diagram.resizeToFitItems(50);
        }
    }

Thanks it works
Can you please let me know how can we arranges these nodes in a tree layout?

No i mean to we have many custom container and i need arrange all the container in to Tree lay out how can we achieve this.