Changing parameters of StageWebView after it has been defined. [HELP]

How can I change the x and y paramaters of a stageWebView once it has been defined ?

var socialWebView:StageWebView;

var path = "http://www.google.ca" as String;

socialWebView.stage = this.stage;

socialWebView.viewPort = new Rectangle(0, 42, 1024, 728);

socialWebView.loadURL(path);

How come this wont work (  socialWebView.x = 10 )   ????

Any help is appreciated