Casting Glib::RefPtr

Hello. This piece of code doesn't compile:

	Glib::RefPtr<Gtk::Builder> b = Gtk::Builder::create_from_file("prueba.ui");

	Gtk::Window * w;
	Gtk::TreeView * view;
	Glib::RefPtr<Glib::Object> liststore;

	b->get_widget("window1", w);

	Glib::RefPtr<Glib::Object> o = b->get_object("liststore");
        //This line is the one that does not compile

I want to cast to a liststore an object in the last line, but I can't.
Which is the correct way to do it?

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