[flexcoders] Problem to extend HTTPService

[vive]

Hello,

I am trying to extend HTTPService to add some processing of the result
before returning it however I have some problem when I try to compile.
My component is very simple right now:

package bnp.rpc.http.mxml
{
        import mx.rpc.http.mxml.HTTPService;
        import mx.rpc.events.ResultEvent;
        import mx.controls.Alert;

        public class ExtendedHTTPService extends HTTPService
        {
                public function ExtendedHTTPService(url:String):void
                {
                        this.addEventListener(ResultEvent.RESULT, 
this.onInternalResult,
true, 0, true) ;
                }
                
                private function onInternalResult(event:ResultEvent):void
                {
                        mx.controls.Alert.show('Hello world!') ;
                }
        }
}




And the declaration of the HTTPServices in the application looks like:

<mx:HTTPService 
                id="testservice1" 
                url="./test.pl"
                resultFormat="text"
                method="POST"
                result="onExternalResult(event) ;"
        >
                <mx:request xmlns="">
                        <p1>toto</p1>
                </mx:request>
        </mx:HTTPService>

        <mxml:ExtendedHTTPService 
                id='testservice2' 
                url="./test.pl" 
                resultFormat="text"
                method="POST"
                result="onExternalResult(event) ;"
        >
                <mxml:request xmlns="">
                        <p1>toto</p1>
                </mxml:request>
        </mxml:ExtendedHTTPService>




The problem is that I can't compile because I get the following error:

Could not resolve <p1> to a component implementation.

for the ExtendedHTTPService declaration. I cannot understand why. I
did not even tried to overload the request property ?!?!
Does anyone have an idea ?

Thanks in advance !!