Flash Player 10 ActiveX

I am using flash player 10 activex to play a youtube clip - however I cannot stop or pause it once it has started..

Code:
Myform.FlashPlayer.Movie = ' http://www.youtube.com/v/QA-TN3-cln4&fs=1&loop=1&autoplay=1'

Stop:
MyForm.Flashplayer.Stop

Has no effect ??

Please help

Thanks