ActionScript 3.0 :: Looping Through Stage And Display Object Items

Actionscript 3.0 looping through stage and DisplayObject items. I'm trying to convert to Actionscript 3.0 and I'm trying to find out how to loop through Stage objects as well as DisplayObject.
With AS 2.0 - I would only have to do:
for(var i in _root) // or MovieClip, this, etc { trace("i: " + i + " [i]: " + _root.[i]);}

In AS 3.0 I found this equivalent which works w/ some objects:
public function debug_object(o:Object, show_all:Boolean):void {
import flash.utils.*; var def:XML = describeType(o);
var props:XMLList = def..variable.@name; if(show_all)
props += def..accessor.@name;
for each (var prop:String in props) {
trace(prop + ": " + o[prop]); }}
this.showChildren(Stage);

This kind of works but the o[prop] always traces undefined and it's not showing any movieClips on the stage. I would like to be able to have the debug object function be able to take Stage and DisplayObject arguments like such:
this.debug_object(Stage, true);
this.debug_object(flash.display.DisplayObject, true);