I am afraid the Diagram cannot layout the shapes in the way shown in the desired picture out of the box.
You can do one of the following:
- use custom Layout written from scratch - you use and set the Position properties of the shapes to layout them in a method
- use existing Sugiyama or TreeLayout method, use DiagramLayout complete method and postion only some of the shapes in its handler
- layout the shapes with mouse in the way you like it, then save the diagram configuration and load it in future usages of the same application if this is applicable in your solution
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