Alpha not Easing

Hello All,

I’m new to Flash and I am having trouble getting this alpha tween to work correctly. It fades and then sometimes returns to full opacity. If I keep clicking the button it will eventually ease out and stay transparent.

var myalphaTweencornerout:Tween = new Tween(corner_btn, “alpha”, Regular.easeOut, corner_btn.alpha, 0, 1, true);

Any ideas?