Add plot to a graph

Hi everybody,
I first a plot on a waveform graph. I want then to add on the same graph a second plot (in my case an exponential who gives the enveloppe of my signal) as you can see in the image attached.
I cannot draw the first plot and then the second plot. The second plot erase the first one. I also try with active plot property but it doesn't seems to work.
I also attached a test VI
Can anyone help me?
thanks in advance
Message Edited by valais on 05-20-2008 07:02 AM
Attachments:
image2.JPG ‏19 KB
AddCurveGraph.vi ‏36 KB

Thanks for your answer Mike,
In fact I don't want to write both channels at the same time. Because in my case, the first plot is a measurement, and I want to draw the enveloppe after. The enveloppe is in an another case event. So the event are separeted.
I try to use active plot like that, but the result is only the second plot. I don't have anymore the first plot.
Any idea?
Message Edited by valais on 05-20-2008 07:21 AM
Attachments:
AddCurveGraph.vi ‏38 KB
image2.JPG ‏5 KB

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