Updates text font widget

        Parameters
        ----------

        textfont: String
        \tFont name

def _update_font(self, textfont):
        """Updates text font widget

        Parameters
        ----------

        textfont: String
        \tFont name

        """

        try:
            fontface_id = self.fonts.index(textfont)
        except ValueError:
            fontface_id = 0

        self.font_choice_combo.Select(fontface_id)