How can I use Column Binding Values in "Mouse Click" expression builder ?

dhydrated

I build a flash line chart and using the Value (Y) Series Mouse Click event to actual call my own custom javascript. I noticed that when using the Show Tooltip expression builder, there is an option to use Available Column Bindings values. But I want to use Available Column Bindings in Mouse Click event which that options is not available. So how can I use the column values in my Mouse Click events for my flash line chart?