// Update the type designator for all ports contained by
// entities contained by the toplevel.
private void _updateAllTypeDisplays() {
if (_toplevel instanceof CompositeEntity) {
CompositeEntity toplevel = (CompositeEntity) _toplevel;
Iterator entities = toplevel.entityList().iterator();
while (entities.hasNext()) {
Entity entity = (Entity) entities.next();
Iterator ports = entity.portList().iterator();