How can I have a video play during the credits of a movie I made in Windows Movie Maker?

I already have the video and credits done. I have Movie Maker 6.0. I want the video to play as the credits are rolling. How can this be done. Add the video to the timeline, then go to Titles and Credits, and select 'Add title on the selected clip'. Select the video you added, then go to 'Change title flv to video converter animation'. Scroll down until you can find the credits effects, and then choose the credits effect you wanted. Add in and customize the text, and viola~! flv video converter Credits on a video! =]