Easy Chart: Pen Focus & Axis Label

I have created an Easy Chart to show historical trending on about 30 tags. I have two different subplots, one to show digital trends and one to show the analog trends. Does anybody know of a way I can have the operator put “focus” on a pen, and have the y-axis label update to the units of that pen’s tag? Basically, I want the operator to be able to look at multiple pens with different units (voltage,amps, hz, %, ect.) and be able to select one pen to focus on and have the y-axis update the label, range, ect. based on that pen’s properties.