Currently music plugin sets focus to the dynamic content list views (top album tracks and similar tracks). This prevents skinners choosing which controls should have focus.

New feature is to change this default behaviour

http://forum.team-mediaportal.com/mediaportal-releases-315/patch-stop-focus-music-now-playing-87571/
http://forum.team-mediaportal.com/mediaportal-releases-315/focus-music-now-playing-82569/