dygraph to display the mouse cursor simultaneously on 3 plots

shiny
#1

For the above, how can we have the mouse cursor to be visible on those 3 plots at one instant?
Thanks.

#2

here, they can do it easily using Java Script.
How can it be achieved using R alone? thanks.
I see a lot of people asking for this solution, but so far no solution using R yet?
#3

It looks like it's an open issue indeed