xmlns:mx="library://ns.adobe.com/flex/mx" width="300" height="280">
// Import the class that defines the event object.
import mx.events.IndexChangedEvent;
import mx.controls.Alert;
private function handleChange(event:IndexChangedEvent):void {
var currentIndex:int=event.newIndex;
Alert.show("You just changed views.\nThe new index is " + event.newIndex + ".");
}