def display_help_in_browser(self, event):
        filename = urllib.request.pathname2url(os.path.abspath(os.path.join(os.path.dirname(__file__), "igrid_help.html")))
        if not filename.startswith("file"):
            filename = "file:" + filename
        webbrowser.open(filename, new=1, autoraise=True)
Show the help-HTML in a browser (as a ``HtmlWindow`` does not understand
dataset/ETHPy150Open ipython/ipython-py3k/IPython/deathrow/igrid.py/IGridFrame.display_help_in_browser