Web flash button

Hi,

i see in all website made with flash that people have a menu bar with something which looks like button.

those buttons include text and a picture usually and an animation when mouse pointer is over those buttons.

i would like to do the same so i was thinking that inserting a new symbol as button could be the main layout for a button.
inside this button i could insert a layer including dynamic text and another layer for the picture.

i try to setup the dynamic text value on fly directly from my main stage but without success.

if my button instance is called ibut_aboutus and the dynamic text instance is call txt_aboutus.
so i try to do this.ibut_aboutus.txt_aboutus.text = “my new text button”;

but this generate me an error as such property does not exist.

how is it possible ?
is there another possibility to do such button without have to convert all my dynamic text to button symbol ?

thx.

A