Need help with making a symbol for slideshow

Hello. I am trying to create a Flash (CS4) website that uses buttons - when clicking on a button, a sound is played.

I am trying to get the button to change color after it’s hit.

The button symbol was made from a dynamic text object.

I’ve tried “b1.textColor = ‘FFFFFF’”. I get error 1119, “Access of possibly undefined property textColor through a reference with static type flash.display.SimpleButton”

What am I doing wrong?

Any help would be much appreciated.

Thank you!