         var index:int = _mxmlContent ? _mxmlContent.indexOf(element) : -1;
         
         if (index == -1)
-            throw ArgumentError(element + " is not found in this Group");
+            throw ArgumentError(resourceManager.getString("components", "elementNotFoundInGroup", [element]));
         else
             return index;
     }

     */
    override public function setChildIndex(child:DisplayObject, index:int):void
    {
        throw(new Error("This method is not available in this class.  Please consult the documentation."));
    }
    
    /**

            maxIndex++;
            
        if (index < 0 || index > maxIndex)
            throw new RangeError(resourceManager.getString("components", "indexOutOfRange", [index]));
    }
 
    /**
