[Feature Request] Passing to XYSeries also an additional object beside x and y values

[GoogleCodeExporter]

I want to suggest the implementation of the following 2 methods:

in XYSerie class
- add (double x, double y, object associatedObj): the object associatedObj is 
not displayed anywhere in chart but only saved in the serie in order to be used 
later by onClick event handler

in SeriesSelection class
- getAssociatedObject(): returns the object passed when creating the XYSerie

Thank you and keep up the good work!

Original issue reported on code.google.com by fede...@gmail.com on 13 Nov 2014 at 8:07