ChartObjectsEventArgs.Area

public ChartArea Area {get;}

chartObjectsEventArgs.Area: ChartArea

protected override void OnStart()
{
    Chart.ObjectsAdded += OnChartObjectsAdded;
}

private void OnChartObjectsAdded(ChartObjectsAddedEventArgs args)
{
    Print("The area now has {0} objects", args.Area.Objects.Count);
}

def on_start(self):
    api.Chart.ObjectsAdded += self.on_chart_objects_added

def on_chart_objects_added(self, args):
    api.Print(f"The area now has {args.Area.Objects.Count} objects")