Buutons, but no icons

[Kees Kling <ckling upcmail nl>]

Hi,

This is my second mail, because it went out without subject.

I'm trying to construct buttons with just an icon. I thought that next 
snippet will do, but I only get empty buttons.

iconify = manage ( new Gtk::Button());
Gtk::Image img(Gtk::Stock::REMOVE,Gtk::ICON_SIZE_BUTTON);
iconify->set_image(img);
iconify->set_tooltip_text("minimize window");
pack_start(*iconify,Gtk::PACK_SHRINK);


What is wrong with my code

Thanks

Kees Kling