public void actionPerformed(ActionEvent e) {
int selectedModelIndex = phaseList.getSelectedIndex();
String desc = (String) phaseListModel.get(selectedModelIndex);
PhaseChangeMessage changeMsg = phaseMap.get(desc);
PhaseSelectionMessage selectionMsg = new PhaseSelectionMessage(
me, changeMsg.getPeriod(), changeMsg.getEpoch(),
changeMsg.getSeriesVisibilityMap());
Mediator.getInstance().getPhaseSelectionNotifier()
.notifyListeners(selectionMsg);