public void setDayBordersVisible(boolean dayBordersVisible) {
        this.dayBordersVisible = dayBordersVisible;
        if (initialized) {
            for (int x = 7; x < 49; x++) {
                if ("Windows".equals(UIManager.getLookAndFeel().getID())) {
                    days[x].setContentAreaFilled(dayBordersVisible);
                } else {
                    days[x].setContentAreaFilled(true);
                }
                days[x].setBorderPainted(dayBordersVisible);
            }
        }
    }