In this video, I go thru some of the new high-level visualization primitives available in CPN Tools 4. http://www.youtube.com/watch?v=9ZcrCt05S2I To create your own extension, simply implement the Extension interface (or inherit from the AbstractExtension class). Pack your class file and https://westergaard.eu/2013/03/advanced-visualization-in-cpn-tools-4/