Bindable event and property

           
<?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>

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Bindable event and property : Bindable Event « Data Model « Flex

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