<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" initialize="initializeHandler(event)">
<mx:Script>
private function initializeHandler(event:Event):void {
countriesService.send( );
}
private function changeHandler(event:Event):void {
statesService.send( );
}
</mx:Script>
<mx:HTTPService id="countriesService" url="http://server.com/countries.xml" />
<mx:HTTPService id="statesService" url="http://server.com/state.php">
<mx:request>
<country>
{country.value}
</country>
</mx:request>
</mx:HTTPService>
<mx:VBox>
<mx:ComboBox id="country" dataProvider="{countriesService.lastResult.countries.country}" change="changeHandler(event)" />
<mx:ComboBox dataProvider="{statesService.lastResult.states.state}" />
</mx:VBox>
</mx:Application>
| 
