endRangeSelectionColor property Null safety

Color? endRangeSelectionColor

Specify the date picker end date of selected range background color in month view when selection mode as range/multi-range selection.

Widget build(BuildContext context) {
 return Scaffold(
   appBar: AppBar(),
     body: Center(
       child: SfTheme(
         data: SfThemeData(
           dateRangePickerThemeData: SfDateRangePickerThemeData(
             endRangeSelectionColor: Colors.green
         child: SfDateRangePicker(),


final Color? endRangeSelectionColor;