Create event object
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Script> private var fontSize:Number = 15; [Bindable(event="maxFontSizeChanged")] public function get maxFontSize():Number { return fontSize; } public function set maxFontSize(value:Number):void { if (value <= 30) fontSize = value; else fontSize = 30; var eventObj:Event = new Event("maxFontSizeChanged"); dispatchEvent(eventObj); } </mx:Script> <mx:TextInput id="myTi" change="maxFontSize=Number(myTi.text)"/> <mx:TextInput id="myTi2" text="{maxFontSize}"/> </mx:Application>