How do you add a click event handler to the vertical axis of a BarChart in FLEX?

Does anyone know if it is possible to add a click event handler to the vertical axis (or any axis) of a barchart in flex? If I add the handler to the BarChart itself, it looks as though the event doesn't fire unless you click on 开发者_高级运维the actual chart, not the axes. Any help is appreciated, if you need more info let me know. Thanks

set verticalAxis property to some implementation of mx.charts.chartClasses.IAxis and add a mouse click event listener to it.