Making a component invisible...

Hi,
I'm trying to make a component in my movie invisible using
the instance._visible = false ActionScript command. It's a button
that was converted to a symbol from a series of filled rectangles
and ovals. It will not go invisible although I can use the same
script on a simple, independent text-box and it works fine. Am I
missing something?
Thanks in advance - Jim.

Thanks for responding. It's working. But I still have some
minor questions.
1) When I put the code within the onMotionFinished function,
it doesn't work. But when I place it at the very beginning (before
the tweening), it works. Why is this?
2) Also, what is the difference between using:
this._visible = false; versus
this.red_mc.triggerBox_red_btn._visible = false; or just
red_mc.triggerBox_red_btn._visible = false;? The latter 2 do
not work. Why is this?
thanks you very much for your help.
Here's the modified snippet with the new code:

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