Perhaps this example from Jon Peltier will help:

http://groups-beta.google.com/group/...f5f5b320?hl=en

--

Vasant




"Mark Stephens" wrote in message
...
I have a line chart with a number of series. You know how if you mouse
over
a line a tool tip shows showing the value, that tells me that excel can
detect the mouse over event over a line. Is it then possible to use this
capability to change the colour of the line whilt the mouse is over it?
The
effect I am after is a glow when the mouse is over a particular line on
the
chart.

Any help would be much appreciated as it will be a cool effect.

Kind regards, Mark Stephens