gtk/gtk.go
func (v *MessageDialog) FormatSecondaryText(format string, a ...interface{}) {
	s := fmt.Sprintf(format, a...)
	cstr := C.CString(s)
	defer C.free(unsafe.Pointer(cstr))
	C._gtk_message_dialog_format_secondary_text(v.native(),
		(*C.gchar)(cstr))
}
func (v *MessageDialog) FormatSecondaryText(format string, a ...interface{}) {
	s := fmt.Sprintf(format, a...)
	cstr := C.CString(s)
	defer C.free(unsafe.Pointer(cstr))
	C._gtk_message_dialog_format_secondary_text(v.native(),
		(*C.gchar)(cstr))
}
// FormatSecondaryText is a wrapper around
// gtk_message_dialog_format_secondary_text().