Gtk::Button with custom icon and label

[gallows <g4ll0ws gmail com>]

Hi there!
Well, I want create a custom button. I've tried this:

	Gtk::HBox* hbox0 = new Gtk::HBox(false, 0);
        Gtk::Label* label0 = new Gtk::Label("_Preview", true);
        Gtk::Image* image0 = new Gtk::Image(Gtk::Stock::YES,
                                            Gtk::ICON_SIZE_MENU);
        hbox0->pack_start(*image0);
        hbox0->pack_start(*label0, true, true, 5);
        button_preview.add(*hbox0);

It works, but there is a memory leak...
Should I use RefPtr<>? If yes, how?

Thanks,

s.