how to make a ruler over the panel

G

gringo

All,

I have a panel with the graph placed on the coordinate system.
I need to make a line which could be moved according to y-coordinate
of the mouse cursor over the graph.
How can I do it with minimal effort?

I have tried to make a transparent panel or something like that but I
can't to obtain transparency.

please help!

Thanks
Grzegorz
 

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