Send a message when the mouse hilites text on an option menu, possible ?

[Rolf Kocherhans]

I have an option menu with say 3 entries. When I click the onto the
option menu, I can see all 3.

When I hover up and down, the one which I am over is hilited.

Is it possible to do something with this hilite ?

I like to show some additional info about the hilited position.

In my case the 3 entries are filepathes and when I am over
the hilite I would like to display for example the first line of that file
in a field.


Cheers
Rolf