         if (item === null)
             throw new Error("DataGroup content can not contain null items.");
             
-        // Rules for skin lookup:
+        // Rules for lookup:
         // 1. if itemRendererFunction is defined, call it to get the renderer factory and instantiate it
         // 2. if itemRenderer is defined, instantiate one
         // 3. if item is a GraphicElement, create the display object for it

        skinRegistry[item] = itemSkin;
    }
    
    protected function unregisterSkin(item:*, itemSkin:DisplayObject):void
    {
        if (!skinRegistry)

        return itemDisplayObject;
    }
    
    /**
     *  Documentation is not currently available. 
     */
    protected function registerSkin(item:*, itemSkin:Object):void
    {
        if (!skinRegistry)
