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if the always on top function is activated and you want to display a video on fullscreenmode, you can'T see the movie, because the VLC window is still on top
But it may also help to try the non embedded mode for wxWidgets.
BTW wxWidgets will be going away on 0.9.0 in favor of QT4 as the old interface is just to difficult to deal with anymore. You could also try the skins2 module.