maximumValue property Null safety

double? maximumValue

Specifies the maximum value of the radial bar.

By default, the sum of the data points values will be considered as maximum value.

Defaults to null

Widget build(BuildContext context) {
   return Container(
       child: SfCircularChart(
           series: <RadialBarSeries<ChartData, String>>[
               RadialBarSeries<ChartData, String>(
                 maximumValue: 100,


final double? maximumValue;