diff -Nur gnome-cups-manager-0.31/gnome-cups-manager/eggtrayicon.c gnome-cups-manager-0.31.new/gnome-cups-manager/eggtrayicon.c
--- gnome-cups-manager-0.31/gnome-cups-manager/eggtrayicon.c	2004-06-24 21:10:47.000000000 +0200
+++ gnome-cups-manager-0.31.new/gnome-cups-manager/eggtrayicon.c	2007-03-30 15:26:33.000000000 +0200
@@ -62,6 +62,9 @@
 static void egg_tray_icon_realize   (GtkWidget *widget);
 static void egg_tray_icon_unrealize (GtkWidget *widget);
 
+static void egg_tray_icon_add (GtkContainer *container,
+			       GtkWidget    *widget);
+
 static void egg_tray_icon_update_manager_window (EggTrayIcon *icon);
 
 GType
@@ -104,6 +107,7 @@
 {
   GObjectClass *gobject_class = (GObjectClass *)klass;
   GtkWidgetClass *widget_class = (GtkWidgetClass *)klass;
+  GtkContainerClass *container_class = (GtkContainerClass *)klass;
 
   parent_class = g_type_class_peek_parent (klass);
 
@@ -112,6 +116,8 @@
   widget_class->realize   = egg_tray_icon_realize;
   widget_class->unrealize = egg_tray_icon_unrealize;
 
+  container_class->add = egg_tray_icon_add;
+
   g_object_class_install_property (gobject_class,
 				   PROP_ORIENTATION,
 				   g_param_spec_enum ("orientation",
@@ -330,6 +336,36 @@
     }
 }
 
+static gboolean
+transparent_expose_event (GtkWidget *widget, GdkEventExpose *event, gpointer user_data)
+{
+  gdk_window_clear_area (widget->window, event->area.x, event->area.y,
+			 event->area.width, event->area.height);
+  return FALSE;
+}
+
+static void
+make_transparent_again (GtkWidget *widget, GtkStyle *previous_style,
+			gpointer user_data)
+{
+  gdk_window_set_back_pixmap (widget->window, NULL, TRUE);
+}
+
+static void
+make_transparent (GtkWidget *widget, gpointer user_data)
+{
+  if (GTK_WIDGET_NO_WINDOW (widget) || GTK_WIDGET_APP_PAINTABLE (widget))
+    return;
+
+  gtk_widget_set_app_paintable (widget, TRUE);
+  gtk_widget_set_double_buffered (widget, FALSE);
+  gdk_window_set_back_pixmap (widget->window, NULL, TRUE);
+  g_signal_connect (widget, "expose_event",
+		    G_CALLBACK (transparent_expose_event), NULL);
+  g_signal_connect_after (widget, "style_set",
+			  G_CALLBACK (make_transparent_again), NULL);
+}	
+
 static void
 egg_tray_icon_realize (GtkWidget *widget)
 {
@@ -343,6 +379,8 @@
   if (GTK_WIDGET_CLASS (parent_class)->realize)
     GTK_WIDGET_CLASS (parent_class)->realize (widget);
 
+  make_transparent (widget, NULL);
+
   screen = gtk_widget_get_screen (widget);
   display = gdk_screen_get_display (screen);
   xdisplay = gdk_x11_display_get_xdisplay (display);
@@ -373,6 +411,14 @@
 			 egg_tray_icon_manager_filter, icon);
 }
 
+static void
+egg_tray_icon_add (GtkContainer *container, GtkWidget *widget)
+{
+  g_signal_connect (widget, "realize",
+		    G_CALLBACK (make_transparent), NULL);
+  GTK_CONTAINER_CLASS (parent_class)->add (container, widget);
+}
+
 EggTrayIcon *
 egg_tray_icon_new_for_screen (GdkScreen *screen, const char *name)
 {