Creates font face buttons

def _create_font_face_buttons(self):
        """Creates font face buttons"""

        font_face_buttons = [
            (wx.FONTFLAG_BOLD, "OnBold", "FormatTextBold", _("Bold")),
            (wx.FONTFLAG_ITALIC, "OnItalics", "FormatTextItalic",
             _("Italics")),
            (wx.FONTFLAG_UNDERLINED, "OnUnderline", "FormatTextUnderline",
                _("Underline")),
            (wx.FONTFLAG_STRIKETHROUGH, "OnStrikethrough",
                "FormatTextStrikethrough", _("Strikethrough")),
            (wx.FONTFLAG_MASK, "OnFreeze", "Freeze", _("Freeze")),
            (wx.FONTFLAG_NOT_ANTIALIASED, "OnLock", "Lock", _("Lock cell")),
            (wx.FONTFAMILY_DECORATIVE, "OnMarkup", "Markup", _("Markup")),
        ]

        for __id, method, iconname, helpstring in font_face_buttons:
            bmp = icons[iconname]
            self.AddCheckTool(__id, iconname, bmp, bmp,
                              short_help_string=helpstring)
            self.Bind(wx.EVT_TOOL, getattr(self, method), id=__id)