ActionScript 3.0 :: Video Player Playing In Background?

I have a video player program, there is a list page and a player page, once you click on an item in the list it takes you to the player page and it loads the correct video from a streaming server for you, easy peasy When each item is picked it finds the corresponding item in an XML file and loads my video player source with the XML data url
 
function beginLoad():void {      this.addChild(videoPlayer)          videoPlayer.source = myXML.video[videoIndex].@url; }
 
(it has nothing to do with this function not happening on mouse event, this is only the part that happens when it loads)My issue is that if you are fast enough and click to return to the list page before the video has started playing, the video will play in the background, even though the code actually removes the video player child from the stage the code on the button to return to the list page is
 
function navToList(e:Event):void {      videoPlayer.stop();      videoPlayer.parent.removeChild(videoPlayer); }
 
there is more code in the button but none of it relates to the videoPlayer item why on earth it continues to play is beyond me, surely if there is no videoPlayer componen on the stage (and this is the only one) then the video has no ability to play whatsoever is there a specific command to tell the videoPlayer item to stop everything and just return to a blank state, do I set its 'source' to nothing?