Typing or copying Unicode text into FreeHand MX

Please help me on inputting Unicode text into FreeHand MX correctly. I have written the following handle:

on setValue(theValue)
	try
		-- bring the target application to the front & update
		tell application "FreeHand MX"
			activate
			Update
		end tell
		tell application "System Events"
			tell process "FreeHand MX"
				tell window "Text Editor"
					keystroke "E" using {command down, shift down}
					keystroke "A" using {command down}
					-- erase original contents
					key code 51
					keystroke theValue as Unicode text
					key code 76
				end tell
			end tell
		end tell
		return true
	on error error_message
		return false
	end try
end setValue

However, it does not work with any Chinese or Japanese. I verified theValue is correctly encoded in UTF-16 as in display dialog shown correclty. Could someone help me?

Thanks a ton!

P.S.

I am running in Mac OS X 10.3.4 with Script Editor 2.0 (v43).