[autoalpha problem]

as we all konw,autoalpha can tween alpha and visible.i have code as follows

 

import com.greensock.TweenMax;

import com.greensock.easing.*;

mc.visible=false

mc.alpha=0

TweenMax.from(mc, 1, {autoAlpha:0,y:400})

 

but seems not work.if i remove mc.visible=false

mc.alpha=0 it works and tween alpha from 0 to 1

if i use tweenmax.to function it works well .