Hi Arthur,
I have attached a file I made this morning which might help.
Looking back, the steps were -
1) Draw a square, copy it twice and align all 3 as needed (these will end up being your buttons).
2) Copy those 3 rectangles, and 'Paste' ...this will place the copied squares in a different location on the layout (easier to see what you are doing).
3) Group the copied rectangles as a shape, name it (you will see in my movie that I have used 'groupedShape01' ...I like sensible names
4) Modify your fill to radial gradient, putting the glow color at LH end and fading to 0% alpha at the other.
5) Use the 'Fill Transform Tool' on the layout panel to modify the gradient to your needs.
6) Now that you have your fill right, copy your grouped shape twice, naming them appropriately (I have used groupedShape02 & 03).
7) Select each of your new grouped shapes and in turn use the 'Fill Transform Tool' to modify the gradient to your needs, dragging the center point across to be over the correct button.
8) Convert each of your grouped shapes to Movie Clips.
9) Look at the timeline of the grouped object in each movie clip to see how I have added the fade in and fade out effects and controlled the playhead by adding stops in the timeline.
10) Now it is a matter of converting each of the original squares you made into buttons and adding the onRollover and onRollout events which will control the movie clip playhead to fade in and out the glow.
11) When you are satisfied that the buttons work, drag each of your movie clips into alignment with the buttons.
This leaves your buttons ready to take your onPress and onRelease events.
I think that about covers what I did, hope it (along with the attachment) helps.
davidp