Traversing the display list in AS3 is so tedious. I wish I could use jQuery/CSS/XSLT style selectors:
$('stage movie button').addChild(child);
jQuery has spoiled me with easy DOM traversal. Instead, we have to do this:
stage.getChildAt(3).getChildAt(12).addChild(child);
Edit: It looks like someone has ported the $-style traversing to AS3. Finally!