self.button = gtk.Button(stock=gtk.STOCK_DELETE)
This is a recent change in GTK - the developers wanted icons not to appear on buttons. On Linux, this can be changed by editing the gconf key
On windows, I think (I haven't actually tried this) that you need to set a value in your gtkrc file (for me it's in
C:\Program Files\Gtk+\etc\gtkrc) and use a theme that supports icons (I think the default one doesn't).
EDIT in answer to your comment:
Just like this answer, but in Python: http://stackoverflow.com/questions/1734914/in-gtk-how-do-i-make-a-button-with-just-a-stock-icon/1735265#1735265
For python, it's just
image = gtk.Image() # (from http://www.pygtk.org/docs/pygtk/gtk-stock-items.html) image.set_from_stock(gtk.STOCK_**) button = gtk.Button() button.set_image(image) button.set_label("")