How to Add new Icon to the palette in BpmnJS?

Developers Modeler
1

I evaluated the new Nyan JS already, and it has some multiple JS dependencies. I am using the properties panel example. But now I need to add one more extra icon to the palette.
Could you tell me how to modify the properties panel example, without using the Nyan example.

2

Please have a look at this example for reference.

Cheers,
Vladimir