Graphs - Plot auxiliary lines

I am in trouble with a multi plot graph. There is a wave chart, and I
have to plot an auxiliary line when the user clicks over the graphic.
I know how to get the initial point and the final point of the
auxiliar line, I get the Y scale range and X absolute value, in other
words, the X value of the place that I click. My doubt is in how can I
plot this auxiliary line in the same graph? There is no problem if I
have to use another labView object to do this task.
Another important thing is that one graph can has many independent and
auxiliary lines.
Any ideas, sugestions or examples?
Thank you in advance

Already answered.
Regards,
Fernanda Silveira.

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Graphs - Plot auxiliary lines

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