Hello Kawashima,
I apologize for this delay in responding.
If your intention is to apply layout on diagram nodes, you can use various built in layout manager classes that are available in Diagram. Referring to the samples under the Diagram Samples\Layout Managers category will give you an idea about how to go about this.
If I have misunderstood your requirement, could you please explain me in detail, so that I can work in
depth and try to send a better solution?
Thanks for your interest in Syncfusion products.
Best Regards,
Meera.
Syncfusion, Inc.
http://www.syncfusion.com/