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How do I drag a vertical line across a 2d line graph?

pod_999pod_999 Member Posts: 1
How do I drag a vertical line across a line graph (displayed on a dialog) & display the intersecting values?

I am using an MFC graph control to display several lines of stored data, on a graph dialog.
I want to be able to display and drag a vertical line along the x-axis (using OnLButtonDown?) which would dynamically display the intersecting line values in, for example, a grid.
I'm new to this forum, so if I'm being a big vague, I can provide more details.
Any help would be much appreciated.
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