I use another method, for me more simple than XML conector.
When you put the URL in your browser, FMS when create the new record return and xml. For do the same in Flash and recover the XML i use the class XML object.
It's easy, is something like this:
var xmlObj = new XML();
xmlObj.onLoad(){
/* the code if you would do anything with the answer, check the error code o something similar.
You need parsing the XML in function the gramar that you use*/
delete this; //delete the XML
}
xmlObj.load(TheURL);
Dani.