How to select a series from its axis


Using ShinobiCharts on iOS, I need to select a series bases on the axis clicked. If you look at the image in the link below,  if one clicks the red axis, the first series needs to be selected and if one clicks the green axis, the second one.

I see SChartAxis extends NSObject and does not give a reference to it’s view. So my question is, is there a way to assign a tap gesture recognizer to each individual axis so I can appropriately select a series? If not, is there a good way to go about this? Thanks in advance.