Security error accessing url on modifying headers with flex

Question

i had to modify the headers as discussed here to allow PUT and DELETE:

http://stackoverflow.com/questions/153420/is-it-feasible-to-create-a-rest-client-with-flex

and also modified my crossdomain as explained here: http://dotanything.wordpress.com/2008/08/11/flex-security-error-accessing-url-or-channelsecurityerror/

yet i still receive a security error accessing url from my flex app.

This is how my code looks like:

<mx:HTTPService id="savePageHttp" showBusyCursor="true"        
        resultFormat="e4x" method="POST" contentType="application/xml"        
        result="savePageHttpResultHandler(event);"
        fault="httpFaultHandler(event);"/>     

Would you guys have any idea?

Thanks in advance.