glib property

[Horváth Imre <blemidon gmail com>]

Hi!

I have problems using Glib::Property in a derived class.
I've got the error:

(a.out:25329): GLib-GObject-CRITICAL **:
g_object_class_install_property: assertion `class->set_property != NULL'
failed

Here is my sample: (gtkmm-2.4)

#include <iostream>
#include <gtkmm.h>

class MyDialog : public Gtk::Dialog
{
public:
	MyDialog(BaseObjectType *_baseObject, const Glib::RefPtr<Gtk::Builder>&
_builder);

private:
	Glib::Property<int *> prop_;
};

MyDialog::MyDialog(BaseObjectType *_baseObject, const
Glib::RefPtr<Gtk::Builder>& _builder)
:	Gtk::Dialog(_baseObject)
,	Glib::ObjectBase("MyDialog")
,	prop_(*this, "prop", NULL)
{
}

int main(int argc, char **argv)
{
  	Gtk::Main kit(argc, argv);

	Glib::RefPtr<Gtk::Builder> refBuilder = Gtk::Builder::create();
	try
	{
		refBuilder->add_from_file("sample.ui");
	}
	catch(const Glib::FileError& ex)
	{
		std::cerr << "FileError: " << ex.what() << std::endl;
		return 1;
	}
	catch(const Gtk::BuilderError& ex)
	{
		std::cerr << "BuilderError: " << ex.what() << std::endl;
		return 1;
	}

	MyDialog *dlg;

	refBuilder->get_widget_derived("dialog1", dlg);
	if(dlg)
	{
		kit.run(*dlg);
	}

	delete dlg;

	return 0;
}