It's a working PM GUI.(Tested!)
Click on M to open the GUI and click on the send message! button to close it.
Leave a reply with your opinion please.
Download link: http://www.mediafire.com/?r38343f4goqrco2
(Sorry for mediafire but community is offline)
Screenshot:http://img684.imageshack.us/img684/9448/mtascreen20100912191342.png