private static void OnSeparatorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ColumnsDateTimeMulti vc = d as ColumnsDateTimeMulti;

            vc.OnPropertyChanged(new PropertyChangedEventArgs(SeparatorProMember));
        }
        private static void OnValuesStringChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ColumnsDateTimeMulti vc = d as ColumnsDateTimeMulti;

            vc.OnPropertyChanged(new PropertyChangedEventArgs(ValuesStringProMember));
        }
        private static void OnDisplayDateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            ColumnsDateTimeMulti vc = d as ColumnsDateTimeMulti;

            vc.OnPropertyChanged(new PropertyChangedEventArgs(DisplayDateProMember));
        }