Use [Bindable] metadata tag to specify to Flex to invoke the isEnabled()function in response to the event myFlagChanged.

           

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<!-- binding/ASFunction.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Script>
         
        import flash.events.Event; 
        // Define a function that gets invoked 
        // in response to the myFlagChanged event. 
        [Bindable(event="myFlagChanged")] 
        private function isEnabled():String { 
            if (myFlag) 
                return 'true'; 
            else 
                return 'false'; 
            } 
        private var _myFlag:Boolean = false; 
        // Define a setter method that dispatches the 
        // myFlagChanged event to trigger the data binding. 
        public function set myFlag(value:Boolean):void { 
            _myFlag = value; 
            dispatchEvent(new Event("myFlagChanged")); 
        } 
        public function get myFlag():Boolean { 
            return _myFlag; 
        } 
      
    </fx:Script>
    <!-- Use the function as the source of a data binding expression. -->
    <s:TextArea id="myTA" text="{isEnabled()}" />
    <!-- Modify the property, causing the setter method to 
        dispatch the myFlagChanged event to trigger data binding. -->
    <s:Button label="Clear MyFlag" click="myFlag=false;" />
    <s:Button label="Set MyFlag" click="myFlag=true;" />
</s:Application>

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Use [Bindable] metadata tag to specify to Flex to invoke the isEnabled()function in response to the event myFlagChanged. : Bindable Event « Data Model « Flex

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