Hi Terry!
Are your searching for solution for MSChart or another ActiveX which can do so (as you wrote in message title)?

I don't familar with MSChart but I use Gigasoft ProEssentials (http://gigasoft.com/) with some code in event handlers to do something like that. It can automatically display coordinates under mouse. It has methods to convert screen coordinates to chart coordinates and vise versa. And I also use event handlers to coordinate chart cursor with VFP grid active record and vise versa.

Of course the library is fully compatible with VFP.

>This is one of the most fab-tastic chart objects I've seen (maybe I am a hillbilly!):
>http://www.fxstreet.com/rates-charts/usdollar-index/
>
>If you click on the "crosshairs", a tooltip returns the value of the curve the pointer is on. If you double click the "cross hairs", a "window" pops up and gives values for all curves on all charts at the vertical intersects that align with the moving mouse pointer.
>
>Is there a way to do something like this in MSCHart? Can every curve pixel be converted to a series value (or an interpolated series value)?
>
>Thanks,
>Terry