tweening multiple objects at once

Hi,

I would like to know if I can get an error or some other problems when I try to tween several objects like this and using an onComplete-property:

Code:

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    TweenLite.to(restartBtn, .5, {alpha:0});
    TweenLite.to(mainMenuBtn, .5, {alpha:0, onComplete:quitFadeIn});

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What I want to do is fade out several objects at once and when they finished a special function gets called. Are there other possibilities when using tweenlite available or do I have to use timelinelite?