anchor.diff:      element.classes.toggle('sharing-dialog', true);
       _summary = summary;
       _text = content.add(new ParagraphElement());
  -    _dialog = content.add(new TextAreaElement());
  +    _textArea = content.add(new TextAreaElement());
  +    _textArea.cols = 75;
  +    _textArea.className = 'dialogBox';
       
       // About to share.
       _cancelButton = new DButton.button(text: 'Cancel');
  
positive.code:     _shareButton.disabled = true;
  
      // TODO: Show a spinner.
      gistController.shareAnon(summary: _dialog.value).then((_) {
        _switchTo(aboutToShare: false);
      }).whenComplete(() {
        _shareButton.disabled = false;
  
negative.code:   final GistController gistController;
  
    ParagraphElement _text;
    TextAreaElement _textArea;
    DButton _cancelButton;
    DButton _shareButton;
    DButton _closeButton;
  