[Mono-list] Use stock icon in GTK treeview?

[Steven F.]

I am trying to insert a stock icon into my GTK treeview, tried a few things,
but have not had any luck so far. Here is what I think should work:
Gtk.ListStore logStore = new Gtk.ListStore (typeof (Gdk.Pixbuf), typeof
(string));
Gtk.Image icon = new Gtk.Image(Stock.Cdrom, IconSize.Dialog);
iconPixbuf = icon.Pixbuf;
logStore.AppendValues (iconPixbuf, "Testing");

Sadly, this gives me a warning at runtime:
Gtk-CRITICAL **: gtk_image_get_pixbuf: assertion `image->storage_type ==
GTK_IMAGE_PIXBUF || image->storage_type == GTK_IMAGE_EMPTY' failed
What is this all about? Why did that assertion fail?
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