SeriesVisibilityChange

This event is raised, when a series is hidden or shown, by clicking on the series item in the legend.
A single argument is passed to the function. Given that this single argument is called "args"
in the handler, like this:

<shield:ShieldChart runat="server">
    <ClientEvents SeriesVisibilityChange="seriesVisibilityChange" />
...
<script type="text/javascript">
    function seriesVisibilityChange(args) {
        // handle the event
    }
</script>

Gives access to the following properties:
args.dataSeries.id
args.dataSeries.collectionAlias
args.dataSeries.color
args.dataSeries.axisX
args.dataSeries.axisX.min
args.dataSeries.axisX.max
args.dataSeries.axisX.type
args.dataSeries.axisY
args.dataSeries.axisY.min
args.dataSeries.axisY.max
args.dataSeries.axisY.type
args.dataSeries.points