public AggregateEventNode(final AggregateEvent event, AggregateEventNode parentEventNode, EventDetailChart chart) {
this.event = event;
descLOD.set(event.getLOD());
this.parentEventNode = parentEventNode;
this.chart = chart;
final Region region = new Region();
HBox.setHgrow(region, Priority.ALWAYS);
final HBox hBox = new HBox(descrLabel, countLabel, region, minusButton, plusButton);
hBox.setPrefWidth(USE_COMPUTED_SIZE);
hBox.setMinWidth(USE_PREF_SIZE);
hBox.setPadding(new Insets(2, 5, 2, 5));