require 'gtk'

window = Gtk::Window.new(Gtk::WINDOW_TOPLEVEL)
button = Gtk::Button.new
window.realize

pix, mask = Gdk::Pixmap.create_from_xpm(window.window, nil, 'test.xpm')
pm = Gtk::Pixmap.new(pix, mask)

label = Gtk::Label.new('pixmap button')

vbox = Gtk::VBox.new(false, 0)
vbox.pack_start pm
vbox.pack_start label
pm.show
label.show
vbox.show

button.add vbox
window.add button
button.show
window.show

Gtk.main