Simple button with text

Ugh, I’m such a noob, but I can’t figure this out, I have a piece of text which I’ve made a button symbol. I’ve set the text to change color and play a sound on the over and down frames inside the button…

Trouble is, the button doesnt work. If I roll my mouse over the text, nothing happens… if I click on it, nothing happens. It’s like its not even a button!