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Using n escaped newline character and the entity for tooltip

<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"   initialize="doSomething(event)">   <mx:Script>     public function doSomething(event:Event):void {       b1.toolTip = "A \n B.";     }     </mx:Script>   <mx:Button id="b1" label="Clear" width="100" />   <mx:Button id="b2" label="Submit" width="100" toolTip="A &#10; B." /> </mx:Application>