Use this function if you have several data series plotted on the same chart, and you need to know which one the user clicked on, or some external code attempted to update. By default, series are un-named, so it is essential to name them uniquely if you want to drill-down from a data point on a chart with more than one series drawn against the same set of axes.

chSeries'Budget'

This is also used in the chart viewer to identify the series as you move the mouse over the data points. See psFindSeries for the code which you need to make use of these series names.

See also ...
CDATA – chart data was clicked