integrating facebook login

I am trying to integrate fb login to my app. I added the script to initialize the js:

   

<div id="fb-root"></div>
    <script>
    (function(d, s, id) {
            var js, fjs = d.getElementsByTagName(s)[0];
            if (d.getElementById(id))
                return;
            js = d.createElement(s);
            js.id = id;
            js.src = "//connect.facebook.net/en_US/sdk.js#xfbml=1&appId=<app_id>&version=v2.1";
            fjs.parentNode.insertBefore(js, fjs);
        }(document, 'script', 'facebook-jssdk'));
    </script>

Added the login button as HTML in my uiBinder:

<g:HTML ui:field="fbLoginButton" />

and in view class:

fbLoginButton.setHTML("<fb:login-button max_rows='1' size='medium' show_faces='false' auto_logout_link='false'></fb:login-button>");

and called fb parsing as jsni:

private native void parseDomTree() /*-{
        $wnd.FB.XFBML.parse();
  }-*/;

The login button still does not show up on screen. What did I miss?

Thanks,
Tushar

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