 		
 		public function toString() : String
 		{
-			return "[" + getQualifiedClassName(this) + " " + name + "]";
+			return '[' + getQualifiedClassName(this) + ' ' + name + ']';
 		}
 
 		/**

		public function getChildIndex(child : ISceneNode) : int
		{
			if (child == null)
				throw new Error("The 'child' parameter cannot be null.");
			
			for (var i : int = 0; i < _numChildren; i++)
				if (_children[i] === child)

		public function addChildAt(node : ISceneNode, position : uint) : Group
		{
			if (!node)
				throw new Error('Parameter \'scene\' must not be null.');

			node.parent = this;

