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;
}

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