how 2 add a movable vertical line in a graph of xy axis wpf

Hi,
 
I have a need to have a movable slider on line charts. The way it should work is as follows:
 
1. Slider/Cursor should be parallel to Y-axis i.e. vertical axis
 
2. When user moves this slider, corresponding/intersecting Y values on all graphs show up in labels just like a stock ticker chart.
 
3 the intersection of slier with the graph line ,the value should be displayed in textbox
 


 
Thanks,
avinash