Connected groups can be highlighted. I have enhanced the RTMetricNormalizer for this. This feature has been on my todo list for too long :-)
-=-=-=-=-=-=-=-=
b := RTMondrian new. b shape box size: 10. b nodes: RTShape withAllSubclasses.
b shape arrowedLine withOffset. b edges moveBehind; connectToAll: #dependentClasses. b layout force charge: -300. b normalizer distinctColorForGroup. “ <==== That is the new thing " b