ActionScript 3.0 :: Changing Object Properties With Code?

For the first stage, I was able to build a walk-through demo in flash pro by creating buttons that when clicked caused the flash to change to different frames. easy enough. Now for the final part of this project, I need to make the interface fully interactive, as I was trying before. ie: you can click any button and lights go on and off or a loop counter increments, etc. Since there is logic involved and too many permutations to do a frame for each possible state, I'm back to trying to do this in an object oriented way. I've got some test code here.

<fx:Script>
<![CDATA[
protected function button1_clickHandler(event:MouseEvent):void
{

[code]....

debugger has some errors, so i don't know what exactly it will do. the errors are at the last two if statements where i'm trying to change the object property setting of the label. there is another error at the last curly bracket.

the idea is that there are two labels and a button. the first label starts out visible. when the button is clicked, a counter is checked, and incremented, then the counter is again checked and the appropriate label has it's visible property set to true. the intent is that in a list of several labels, pressing the button scrolls down them, until you press while on the last, which resets the counter and the first label becomes the visible one.