code: func (v *FontButton) SetFontName(fontname string) bool {
  	cstr := C.CString(fontname)
  	defer C.free(unsafe.Pointer(cstr))
  	c := C.gtk_font_button_set_font_name(v.native(), (*C.gchar)(cstr))
  	return gobool(c)
  }
docs: // SetFontName is a wrapper around gtk_font_button_set_font_name().