public void onMouseOver(MouseOverEvent event) {
UiEvent e = (UiEvent) event.getSource();
assert e != null;
GraphCalloutModel calloutModel = getVisualization().getTimeline().getModel().getGraphCalloutModel();
calloutModel.update(e.getTime(), e.getDuration(),
UiEvent.typeToDetailedTypeString(e), 0, true);
}
};
// Create the EventFilterPanel UI.