java universal tween: how to manage and kill tween
<p>I just learn and use java universal tween for my android game project. It's great, indeed: easy and familiar for me. But TweenManager class' behavior is a bit strange when I tween two DIFFERENT objects in libgdx. 
Object A: </p>

<p>Tween.to( object_A, MyAccessor.POSITION_X, TWEEN_DURATION )
            .target( x )
            .ease(Elastic.OUT)
            .setCallback(callback)
            .start(tweenManager);</p>

<p>Object B: </p>

<p>Tween.to( object_B, MyAccessor.POSITION_ALPHA, TWEEN_DURATION )
            .target( alpha )
            .ease(Elastic.OUT)
            .setCallback(callback)
            .start(tweenManager);</p>

<p>When I start those tweens AT THE SAME TIME, It tweens x and alpha of both objects! Just can't understand what happen here! Could you help me explain the reason for this bug?</p>
