Stretch video in fullscreen

Question

I'm new to programming in C# and I have a single problem with using Windows Media Player in my application. I'm using 16:9 screen and video played is in 4:3 format and when it goes fullscreen it preserves aspect ratio displaying 2 black bars on each side of video. Is there any way to make WMP stretch the video to the whole screen? I can't find solution to that :/