Hi Kawashima,
Thank you for your interest in Syncfusion products.
How to draw a custom flow graphic You can use the Symbol designer itself to draw such custom graph. For ID and Name, you can use Tag and Name property.
You can use the Symbol designer from the below location:
Program Files\Syncfusion\Essential Studio\X.X.X.X\Windows\Diagram.Windows\Symbol Designer
Online Documentation link on using Symbol Designer:
http://www2.syncfusion.com/ug_61/diagram/SymbolDesigner.htmlPlease refere the below sample browser for Custom Symbols
\\Syncfusion\EssentialStudio\X.X.X.X\Windows\Diagram.Windows\Samples\2.0\Symbol Design\CustomSymbol
Please dwonload the sample from the below location:
http://websamples.syncfusion.com/samples/Diagram.Windows/P70800/main.htmIn this sample we have created a graph using the Symbol designer itself, for TextNode alone we have used the code.
Please let me know if you have any questions.
Best Regards,
Bhuvana