isTrackVisible property Null safety

bool isTrackVisible
final, inherited

Renders column with track. Track is a rectangular bar rendered from the start to the end of the axis. Column series will be rendered above the track.

Defaults to false

Widget build(BuildContext context) {
   return Container(
       child: SfCartesianChart(
           series: <StackedColumnSeries<SalesData, num>>[
               StackedColumnSeries<SalesData, num>(
                 isTrackVisible: true,


final bool isTrackVisible;