private void ButtonGoTo_Click(object sender, EventArgs e)
        {
            OnBeginNavigate?.Invoke();

            DateTime targetMon = Common.GetMondayForWeek(dateTimePickerGoTo.Value);
            DateTime targetSat = Common.GetFridayForWeek(dateTimePickerGoTo.Value).AddDays(1);

            ganttChart.StartDate = targetMon;
            ganttChart.EndDate   = targetSat;

            ganttChart.UpdateView();
        }
        private void ButtonRight_Click(object sender, EventArgs e)
        {
            OnBeginNavigate?.Invoke();

            DateTime ganttStart = ganttChart.StartDate;
            DateTime ganttEnd   = ganttChart.EndDate;

            ganttChart.StartDate = ganttStart.AddDays(7);
            ganttChart.EndDate   = ganttEnd.AddDays(7);

            ganttChart.UpdateView();
        }