Someone

import gtk
import hippo

window = gtk.Window()
window.connect("destroy", lambda w: gtk.main_quit())
window.set_default_size(640, 480)
window.show()

canvas = hippo.Canvas()
canvas.show()
window.add(canvas)

box = hippo.CanvasBox(background_color=0xffffffff)
canvas.set_root(box)

button = gtk.Button('dude')
button.show()
hippo_button = hippo.CanvasWidget()
hippo_button.widget = button
hippo_button.allocate(50, 30)
box.append(hippo_button, 0)

gtk.main()