FlexChart allows you to toggle the visibility of a series in the plot, when you click the series item in the legend by means of the LegendToggle property.

The default value of the LegendToggle property is False. To enable series toggling, you need to set the LegendToggle property to True.

Here is the code snippet:

FlexChart1.LegendToggle = True

flexChart1.LegendToggle = true;