which effects? There are dozens of them.. blur, glow, dropshadow, selfmade filters, pixelbender, animation properties...
could you more precise?
I would like "Glow" effect on when I move cursor over the button. Please reply.
Check out the following link on adding filters to symbols.
In your case make your button listen to the mouse OVER event.
You can achieve the same by adding the following piece of code
//code for glow filter goes here
Hope it helped