.createPhaseChangeListener());
this.newStarNotifier.addListener(this.documentManager
.createNewStarListener());
// Undoable action manager creation and listener setup.
this.undoableActionManager = new UndoableActionManager();
this.newStarNotifier.addListener(this.undoableActionManager
.createNewStarListener());
this.observationSelectionNotifier
.addListener(this.undoableActionManager
.createObservationSelectionListener());