Adjusting simple button .y losing button functionality

I’m trying to dynamically move a “more info” button right under a block of text based on the height of the text. The problem is when I move the button in code, the button is no longer clickable(??). I’m using the CS3 IDE and creating a simpleButton. simpleButton is supposed to inherit the displayObject class so I don’t understand why this is happening. If I trace out the button reference, it traces [object SimpleButton]. I have a textfield named ‘txt’ and button named ‘btn’ on the stage.

btn.y = txt.y + txt.textHeight + 10