Close Window - why is this not working?

[johnkainn]

Hi,
I am unable to close the popUp window. Does anyone know why this code is not working?

import mx.managers.PopUpManager;
import mx.containers.Window;
var cwMessage:MovieClip;
button.onRelease=function(){
cwMessage = PopUpManager.createPopUp(_root, Window, true, {contentPath:"myMovieClip", closeButton:true});
cwMessage.setSize(150, 200);
}
var lo:Object = new Object();
lo.click = function() {
cwMessage.deletePopUp();
};
cwMessage.addEventListener("click", lo);

Thanks