void calendar_SelectedDatesChanged(object sender, vhCalendar.SelectedDatesChangedEventArgs e)
        {
            SelectedDatesChangedGridViewEventArgs even = new SelectedDatesChangedGridViewEventArgs(SelectedDatesGridViewChangedEvent);

            ValuesString = "";
            foreach (DateTime datetime in e.NewDates.OrderBy(f => f))
            {
                ValuesString += Separator + datetime.ToString(FormatString);
            }
            if (ValuesString.Length > 1)
            {
                ValuesString = ValuesString.Substring(1);
            }
            even.NewDates = e.NewDates;
            even.OldDates = e.OldDates;
            even.Cell     = cellCurrent;
            TextBox txt = cellCurrent.FindChildByType <TextBox>();

            if (!LObject.IsNullOrEmpty(txt))
            {
                txt.Text = ValuesString;
            }
            RaiseEvent(even);
        }