DirectX AudioVideoPlayback Transparent color

Question

I would like to set the transparent color for an avi Playback in DirectX. Does any one have any suggestions on how to do this.

Update:

I am using the below method to play an avi File:

System.Windows.Forms.Panel VidPnl = new System.Windows.Forms.Panel();
Microsoft.DirectX.AudioVideoPlayback.Video _video = new   Microsoft.DirectX.AudioVideoPlayback.Video("test.avi");
_video.Owner.VidPnl;
_video.Play();

I would like to replace replace colors in the avi to be transparent.

Thanks