Alert control sizes itself to fit its text, buttons, and icon

        

<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.controls.Alert;
        public var myAlert:Alert;
        private function openAlert():void {
            myAlert = Alert.show("this is a test", "Alert", Alert.OK | Alert.CANCEL);
            myAlert.height=150;
            myAlert.width=150;
        }
      
    </mx:Script>
    <mx:TextInput id="myInput" width="150" text="" />
    <mx:Button id="myButton" label="Copy Text" click="openAlert();" />
    <mx:TextInput id="myText" />
</mx:Application>

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Alert control sizes itself to fit its text, buttons, and icon : Alert « Components « Flex

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