flex label竖排 纵向 显示text

private function rotationText(event:FlexEvent):void{ 
                var text:String = event.currentTarget.text; 
                var length:int = text.length; 
                var newText:String = ""; 
                for(var i:int = 0; i < length; i++) 
                { 
                    newText+=text.charAt(i)+"\r"; 
                } 
                label.text = newText; 
            } 




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<s:Label id="label" text="我是K" x="100" y="40" initialize="rotationText(event)"/>