Kantaris Media Player

When I am at the movie trailers or the video library section and I open the
stream dialog window (play -> URL(internet stream)), the window is hidden
behind the media player and I can't type the URL and press play.
Then, I select the window again from the task bar, it comes in front of the
media player but when I drag the pointer of my mouse on the media player,
the stream dialog window goes again behind the player.