How to add custom node to diagram builder

Hi
I try to use diagram-buidler addons https://vaadin.com/directory#!addon/diagram-builder
I need to add new node type with new properties.
Please if someone know how and where to add changes?

Please helllllp me !!!

Hi,

Maybe this example code helps you:
https://github.com/mstahv/diagram-builder/blob/master/diagram-builder-demo/src/main/java/org/vaadin/diagrambuilder/demo/DemoUI.java#L89-L182

cheers,
matti