Initial the first UI page.
        - load html from '/' endpoint
        - if <title> is defined, use as windows title

def _init_ui(self):
        """Initial the first UI page.
        - load html from '/' endpoint
        - if <title> is defined, use as windows title
        """
        (content, mimetype) = make_response(self._url_map_to_function('/'))
        try:
            beautifulsoup = BeautifulSoup(content)
            self.window.set_title(beautifulsoup.find('title').string)
        except:
            pass

        if self.debug is True:
            print self.app_dir

        # Use load_string instead of load_uri because it shows warning.
        self.webkit_web_view.load_string(
            content,
            mime_type=mimetype,
            encoding='utf-8',
            base_uri='/',
        )