/** Displays the number of overdue tasks, and displays nothing when there are no overdue tasks. */
private void showOverdueCounter() {
if (getNoOfDAndETasks(MainLogic.getExpiredTasks()) > 0) {
overdueCounter.setText("" + getNoOfDAndETasks(MainLogic.getExpiredTasks()));
} else {
overdueRectangle.setOpacity(0);
}
}
