=== modified file 'src/gtkutil.c'
--- src/gtkutil.c	2014-07-27 13:21:30 +0000
+++ src/gtkutil.c	2014-07-30 11:01:55 +0000
@@ -3660,6 +3660,15 @@
   /* Set the cursor to an arrow.  */
   xg_set_cursor (webox, FRAME_DISPLAY_INFO (f)->xg_cursor);
 
+  /* Realize so we can ask for underlying resources.  */
+  gtk_widget_realize (wscroll);
+  fprintf (stderr, "Vertical scroll bar's X window: %d\n",
+#ifdef HAVE_GTK3           
+           (int) gdk_x11_window_get_xid (gtk_widget_get_window (wscroll)));
+#else
+           (int) gdk_x11_drawable_get_xid (gtk_widget_get_window (wscroll)));
+#endif
+
   bar->x_window = scroll_id;
   bar->horizontal = 0;
 }
@@ -3727,6 +3736,15 @@
   /* Set the cursor to an arrow.  */
   xg_set_cursor (webox, FRAME_DISPLAY_INFO (f)->xg_cursor);
 
+  /* Realize so we can ask for underlying resources.  */
+  gtk_widget_realize (wscroll);
+  fprintf (stderr, "Horizontal scroll bar's X window: %d\n",
+#ifdef HAVE_GTK3           
+           (int) gdk_x11_window_get_xid (gtk_widget_get_window (wscroll)));
+#else
+           (int) gdk_x11_drawable_get_xid (gtk_widget_get_window (wscroll)));
+#endif
+
   bar->x_window = scroll_id;
   bar->horizontal = 1;
 }