super((IGanttProject) app, (UIFacade) app, zoomManager);
this.setBackground(Color.WHITE);
myTaskManager = taskManager;
myUndoManager = undoManager;
//
myChartModel = new ChartModelImpl(getTaskManager(), app
.getTimeUnitStack(), app.getUIConfiguration());
myChartModel.addOptionChangeListener(new GPOptionChangeListener() {
public void optionsChanged() {
repaint();