Regarding State Chart

I need to remove the Add New Node functionality (currently comes with a ‘+’ symbol in a selected node) from the State Chart Diagram, also, I need to remove / disable the feature of dragging a new arrow from node to node of this chart diagram.

Requesting you to please provide help regarding this.

  1. Don’t use the custom selection Adornment that is in that sample.
    2. Don’t set GraphObject.fromLinkable and .toLinkable.