How to send non-latin unicode characters from Flex application to a web service?

Hi,
I am creating an XML containing data entered by user into a TextInput. The XML is sent then to HTTPService.
I've tried this
var xml : XML = <title>{_title}</title>;
and this
var xml : XML = new XML("<title>" + _title + "</title>");
_title variable is filled with string taken from TextInput.
When user enters non-latin characters (e.g. russian) the web service responds that XML contains characters that are not UTF-8.
I run a sniffer and found that non-printable characters are sent to the web service like
<title>����</title>
How can I encode non-latin characters to UTF-8?
I have an idea to use ByteArray and pair of functions readMultiByte / writeMultiByte (to write in current character set and read UTF-8) but I need to determine the current character set Flex (or TextInput) is using.
Can anyone help convert the characters?
Thanks in advance,
best regards,
Sergey.

Found tha answer myself: set System.useCodePage to false

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