Why is FLVPlayback with no skin render as invisible?

I run the following code using Adobe Flash Professional CS5.5, Flash Player 11.2.202.235, ActionScript 3:

var camera:Camera = Camera.getCamera();
var localVideo:FLVPlayback = ...; // Instantiated by the IDE

[..]

localVideo.getVideoPlayer(localVideo.activeVideoPlayerIndex);
videoPlayer.attachCamera(camera);

Normally, the the local camera's feed shows up inside localVideo, but if I set the FLVPlayback skin to "none" the video component doesn't render at all (it's fully transparent). All I'm trying to do is render a FLVPlayback for a live video feed without any buttons. Any ideas?

Solution

Upon further investigation it turns out that when skin is set to "none" you need to make explicitly mark the video player as visible:

videoPlayer.visible = true;

Does anyone know why that is?