ScrollPane source加载的位置

var slP:ScrollPane=new ScrollPane();

trace((slP.getChildAt(2) as DisplayObjectContainer).numChildren);

var sprt003:Sprite=new Sprite();

slP.source=sprt003;

trace((slP.getChildAt(2) as DisplayObjectContainer).numChildren);

trace((slP.getChildAt(2) as DisplayObjectContainer).getChildAt(0)==sprt003);

//会输出true,就是这里了

slP.update();