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Pass parameter to HTTPService

<?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>