C'è qualcuno che sta usando Flex Builder vers. 3 ?
Seguendo il manuale e riportando fedelmente questo codice e l'annesso codice PHP
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
xmlns="*" creationComplete="send_data()">
<mx:Script>
<![CDATA[
import flash.system.Security;
// Security.loadPolicyFile('http://localhost/crossdomain.xml');
// Security.allowDomain('*');
private function send_data():void {

userRequest.send();
}
]]>
</mx:Script>
<mx:Form x="22" y="10" width="493">
<mx:HBox>
<mx:Label text="Username"/>
<mx:TextInput id="username"/>
</mx:HBox>
<mx:HBox>
<mx:Label text="Email Address"/>
<mx:TextInput id="emailaddress"/>
</mx:HBox>
<mx:Button label="Submit" click="send_data()"/>
</mx:Form>
<mxataGrid id="dgUserRequest" x="22" y="128" dataProvider="{userRequest.lastResult.users.user}" >
<mx:columns>
<mxataGridColumn headerText="User ID" dataField="userid"/>
<mxataGridColumn headerText="User Name" dataField="username"/>
</mx:columns>
</mxataGrid>
<mx:TextInput x="22" y="292" id="selectedemailaddress"
text="{dgUserRequest.selectedItem.emailaddress}"/>
<mx:HTTPService id="userRequest" url="http://localhost/myproj/request_post2.php" useProxy="false" method="POST">
<mx:request xmlns="">
<username>{username.text}</username>
<emailaddress>{emailaddress.text}</emailaddress>
</mx:request>
</mx:HTTPService>
</mx:Application>

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute"
xmlns="*" creationComplete="send_data()">
<mx:Script>
<![CDATA[
import flash.system.Security;
// Security.loadPolicyFile('http://localhost/crossdomain.xml');
// Security.allowDomain('*');
private function send_data():void {

userRequest.send();
}
]]>
</mx:Script>
<mx:Form x="22" y="10" width="493">
<mx:HBox>
<mx:Label text="Username"/>
<mx:TextInput id="username"/>
</mx:HBox>
<mx:HBox>
<mx:Label text="Email Address"/>
<mx:TextInput id="emailaddress"/>
</mx:HBox>
<mx:Button label="Submit" click="send_data()"/>
</mx:Form>
<mxataGrid id="dgUserRequest" x="22" y="128" dataProvider="{userRequest.lastResult.users.user}" >
<mx:columns>
<mxataGridColumn headerText="User ID" dataField="userid"/>
<mxataGridColumn headerText="User Name" dataField="username"/>
</mx:columns>
</mxataGrid>
<mx:TextInput x="22" y="292" id="selectedemailaddress"
text="{dgUserRequest.selectedItem.emailaddress}"/>
<mx:HTTPService id="userRequest" url="http://localhost/myproj/request_post2.php" useProxy="false" method="POST">
<mx:request xmlns="">
<username>{username.text}</username>
<emailaddress>{emailaddress.text}</emailaddress>
</mx:request>
</mx:HTTPService>
</mx:Application>


mi da sempre un errore 2070 violazione sandbox

Cosa vuol dire ?