[flexcoders] accessing styles of children

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videoButtonBox. is an VBox with HBoxes for children.
How do I change styles as I iterate thru children?
videoButtonBox.getChildAt(i).setStyle() is not a function.

var numChildren:Number = videoButtonBox.numChildren;
    for (var i:int = 0; i < numChildren; i++) {
      videoButtonBox.getChildAt(i)
    }

This page talks about rawChildren as a way to access styles, but I have 
read it 10 times and I have no idea what they are trying to describe.