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ComboBox change event

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="initHandler();">       <mx:Script>                      private var myString:String;             private var myStringArray:Array = ["A", "B", "C"];             private function initHandler():void             {                 fruitCB.dataProvider = myStringArray;             }             [Bindable(event="myStringValueChanged")]             private function isOrangeChosen():Boolean             {                 return myString == "Orange";             }             public function get fruit():String             {                 return myString;             }             public function set fruit( str:String ):void             {                 myString = str;                 dispatchEvent( new Event( "myStringValueChanged" ) );             }            </mx:Script>     <mx:Label text="select a fruit:" />     <mx:HBox>         <mx:ComboBox id="fruitCB" change="{fruit = fruitCB.selectedLabel}" />         <mx:Button label="Eat the orange." enabled="{isOrangeChosen()}" />     </mx:HBox> </mx:Application>