I am Link

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" 
	backgroundColor="#FFFFFF" width="300" height="200">
 
	<mx:Script>
		<![CDATA[
			include "/as/phoneformat.as";
		]]>
	</mx:Script>
 
	<mx:PhoneFormatter 	id="usPhone" 
				formatString="(###) ###-####" 
				validPatternChars="#-() "/> 
 
	<mx:TextInput x="91.5" 
				  y="89" 
				  id="_phone" 
				  change="setPhone();" 
				  width="110" 
				  restrict="0-9"/>
 
	<mx:Label 	x="48.5" 
				y="91" 
				text="Phone"/>
 
	<mx:Button 	x="146.5" 
				y="119" 
				label="Clear" 
				click="_phone.text = '';"/>
 
 
</mx:Application>

 
// ActionScript file
 
[Bindable] public var phone:String = "";
 
private function setPhone():void {
	var area:String;
	var prefix:String;
	var phonenumber:String;;
 
 
	//when the numbers in length you type is equal
	// to 3 then format areacode.	
	if(_phone.length == 3){
		_phone.text = "(" + _phone.text + ") "
		_phone.setSelection(6,6);
 
	}
 
	//add dash to text field and set the cursor
	if (_phone.length == 9){
		_phone.text = _phone.text + "-";
		_phone.setSelection(10,10);
		_phone.maxChars = 14;
	}
 
 
 
	// now finally get the number only with no format to save to the DB and
	// reformat the phone incase formatting misses. 
	//This is mainly for users that just type a bunch of numnbers really fast,
	// it will still format the number 
	if(_phone.length == 14){
 
		area = _phone.text.slice(1,4);
		prefix = _phone.text.slice(6,9);
		phonenumber = _phone.text.slice(10,14);
 
		phone = area + prefix + phonenumber;
 
		_phone.text = usPhone.format(phone);
 
	}
 
}