private static void OnTextFieldChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e, Action <DateRange, string> action)
{
DateRangePicker2 dateRangePicker = (DateRangePicker2)sender;
DateRange oldDateRange = dateRangePicker.DateRange;
DateRange newDateRange = (DateRange)oldDateRange.Clone();
action(newDateRange, (string)e.NewValue);
dateRangePicker.DateRange = newDateRange;
}