XY graph as a chart cursor question

I have several XY graphs that are behaving as a chart. On the graph when a user moves the cursor to a peak I read in the X and Y values. I also want to be able to follow that peak until the user moves the mouse again.
Currently when a new data point comes in the cursor stays in the same X location and I get updated data. What I want is, let's say the user moves the cursor to time 8:00:01. When the next update comes along the cursor should stay on time 8:00:01, but right now the cursor stays in position and I am reading in time 8:00:02. Does anyone know how to do this, without using property nodes? As I write this I realize that I can do this with an event structure and property nodes.

By far the best way will be with property nodes etc. The only other idea I had would be to somehow actually plot data as the cursor, therefore when more data comes in the "cursor" actually moves with it. However even to accomplish this I think you would still be using property nodes. So I would say use the property nodes to move a real cursor.

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XY graph as a chart cursor question

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