Actionscript 3.0 :: Cast Array To Sprite?

i have an array of Sprites object reference

Code: Select allvar clipps:Sprite = new Sprite();
bildArray[i] =clipps;

And later in the code i want to get the x position of the sprite in the array-

Code: Select allTweener.addTween(bildArray[i], {x:(bildArray[i].x +50), time:3, transition:"linear"});

dose not worke so i need to cast it to Sprite?so i do

Code: Select allvar v:Sprite = bildArray[i] as Sprite;
Tweener.addTween(bildArray[i], {x:(v.x +50), time:3, transition:"linear"});

But it dose not work, what do i do wrong?