MouseEnter event does not fire while entering a node. This script shows the demonstrates the problem.
view := ROMondrianViewBuilder new. view shape rectangle size: 20. view interaction on: ROMouseEnter do: [ :event | view shape line color: Color blue. view edgesFrom: [ :i | i \ 2 ]. ]. view nodes: (1 to: 20). view shape line. view treeLayout. view open tx, Usman Bhatti