private void RefreshInterval()
        {
            int index = this.comboBoxInterval.SelectedIndex;
            IntervalDate custom = null;
            if (this.comboBoxInterval.Items.Count > 4)
            {
                IntervalDate tmp = (this.comboBoxInterval.Items[4] as IntervalDate);
                custom = new IntervalDate()
                {
                    Label = "Custom",
                    Date = this.startTime,
                    DateFormat = tmp.DateFormat,
                    DelayType = tmp.DelayType,
                    Delay = tmp.Delay
                };
            }
            this.comboBoxInterval.Items.Clear();
            this.comboBoxInterval.Items.Add(new IntervalDate() {
                 Label = "Day",
                 Date = this.startTime,
                 Delay = 1
            });

            IntervalDate week = new IntervalDate() { Label = "Week", DelayType = DelayType.Week };
            switch(this.startTime.DayOfWeek)
            {
                case DayOfWeek.Monday:
                    week.Date = this.startTime;
                    break;
                case DayOfWeek.Tuesday:
                     week.Date = this.startTime.AddDays(-1);
                    break;
                case DayOfWeek.Wednesday:
                     week.Date = this.startTime.AddDays(-2);
                    break;
                case DayOfWeek.Thursday:
                     week.Date =  this.startTime.AddDays(-3);
                    break;
                 case DayOfWeek.Friday:
                    week.Date = this.startTime.AddDays(-4);
                    break;
                 case DayOfWeek.Saturday:
                     week.Date = this.startTime.AddDays(-5);
                    break;
                case DayOfWeek.Sunday:
                     week.Date = this.startTime.AddDays(-6);
                    break;

            }
            this.comboBoxInterval.Items.Add(week);
            IntervalDate month = new IntervalDate() { Label = "Month", Date = new DateTime(this.startTime.Year, this.startTime.Month, 1), DateFormat = "MM.yyyy", DelayType = DelayType.Month};
            this.comboBoxInterval.Items.Add(month);
            IntervalDate year = new IntervalDate() { Label = "Year", Date = new DateTime(this.startTime.Year, 1, 1), DateFormat = "yyyy", DelayType = DelayType.Year };
            this.comboBoxInterval.Items.Add(year);
            if (custom != null)
            {
                this.comboBoxInterval.Items.Add(custom);
            }
            this.comboBoxInterval.SelectedIndex = index;
        }
 private void buttonSelect_Click(object sender, RoutedEventArgs e)
 {
     IntervalWindow window = new IntervalWindow();
     window.Owner = this;
     window.StartDate = this.startTime;
     window.EndDate = this.startTime;
     if (window.ShowDialog() == true)
     {
         int delay = (int)(window.EndDate.Value.AddDays(1) - window.StartDate.Value).TotalDays;
         IntervalDate custom = new IntervalDate() { Label = "Custom", Date = window.StartDate.Value.Date.ToUniversalTime(), DateFormat = "dd.MM.yyyy", DelayType = DelayType.Day, Delay= delay };
         this.comboBoxInterval.Items.Add(custom);
         this.comboBoxInterval.SelectedIndex = this.comboBoxInterval.Items.Count - 1;
     }
 }