Displaying
What a good is a pixmap when you can't display it? There are couple of approaches to doing this.

<?php
  list($pixmap, $mask) =
     gdk::pixmap_create_from_xpm($window->window,
                                 null, "gtk-logo.xpm");
  $gtkpix = &new GtkPixmap($pixmap, $mask);
  $window->add($gtkpix);
?>