func (b *Builder) native() *C.GtkBuilder {
	if b == nil || b.GObject == nil {
		return nil
	}
	p := unsafe.Pointer(b.GObject)
	return C.toGtkBuilder(p)
}
func (b *Builder) native() *C.GtkBuilder {
	if b == nil || b.GObject == nil {
		return nil
	}
	p := unsafe.Pointer(b.GObject)
	return C.toGtkBuilder(p)
}
// native() returns a pointer to the underlying GtkBuilder.