Silverlight 2通过Windows Media Services 9

I have been using the Silverlight 2 Media Player that comes with Expression Blend and also the sl2videoplayer from CodePlex and the issue I have come across is that I am unable to forward or rewind the video when it is coming via WMS 9. If I host the same video on a IIS 6 website, it works fine.I have been using the Silverlight 2 Media Playe