private class MyCustomPopupWindow extends JFrame
    {

        private ScheduleMerge scheduleTaskMerge;
        private FlatDatePicker datePicker;

        public MyCustomPopupWindow(Point coordinates, ScheduleMerge scheduleTaskMerge)
        {
            super();

            fakePopupWindow = this;
            this.scheduleTaskMerge = scheduleTaskMerge;

            this.setUndecorated(true);
            this.setAutoRequestFocus(true);
            this.setSize(new Dimension(370, 30));
            this.setLocation(new Point(coordinates.x, coordinates.y));
            this.setDefaultCloseOperation(HIDE_ON_CLOSE);
            this.setType(Type.UTILITY);

            initialise();
        }

        private void initialise()
        {
            datePicker = new FlatDatePicker(FlatDatePicker.TYPE_PICKER_DAY, SwingConstants.LEFT, true, false);
            datePicker.setLocale(Shared.configuration.getLocale());
            datePicker.setTimestamp(scheduleTaskMerge.getModelTask().scheduledTask.specificTimestamp);

            this.getRootPane().setBorder(BorderFactory.createMatteBorder(1, 1, 1, 1, new Color(0, 0, 0)));
            this.setLayout(new BorderLayout());
            this.add(datePicker);
            this.repaint();

        }

        public void close()
        {
            scheduleTaskMerge.getModelTask().scheduledTask.specificTimestamp = datePicker.getTimestamp();
            tableSpecificSchedules.repaint();
            scheduleTaskManager.setButtonSaveState();
            this.dispose();
        }

        public void showPopup()
        {
            this.setVisible(true);
            this.requestFocus();
        }

    }