Status icon for custom node at runtime

Hello All,

our action graph runs for a long time and we would like to show the status of the nodes. (working, done, failed)
I have created a custom node and set its icon. The node can display its status. My problem is that the icon is assigned to the node type. When I change the icon, all the nodes in the graph are updated with the new icon.
Every node in the graph should have its own icon that I can modify. I want to assign an icon to the node instance and not to the type. What do you suggest?
Thanks Balazs

I tried to modify that property but it had no effect.