layout won't scroll

[yanxin <ycui wmsvision com>]

I created a scrolled window and put layput in. But when I scroll the
vertical bar, the contents won't scroll. What could be the root of the
problem?

Here is my code:

scrolledwindow1 = gtk_scrolled_window_new (NULL, NULL);
  gtk_widget_show (scrolledwindow1);
  gtk_container_add (GTK_CONTAINER (eventbox1), scrolledwindow1);
  gtk_widget_set_usize (scrolledwindow1, 200, 200);
  gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolledwindow1),
GTK_POL
ICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);

  layout1 = gtk_layout_new (NULL, NULL);
  gtk_widget_show (layout1);
  gtk_container_add (GTK_CONTAINER (scrolledwindow1), layout1);
  gtk_layout_set_size (GTK_LAYOUT (layout1), 400, 400);
  GTK_ADJUSTMENT (GTK_LAYOUT (layout1)->hadjustment)->step_increment =
10;
  GTK_ADJUSTMENT (GTK_LAYOUT (layout1)->vadjustment)->step_increment =
10;

  layout6 = gtk_layout_new (NULL, NULL);
  gtk_widget_show (layout6);
  gtk_layout_put (GTK_LAYOUT (layout1), layout6, 0, 0);
  gtk_widget_set_usize (layout6, 400, 400);
  GTK_ADJUSTMENT (GTK_LAYOUT (layout6)->hadjustment)->step_increment =
0;
  GTK_ADJUSTMENT (GTK_LAYOUT (layout6)->vadjustment)->step_increment =
0;

  button1 = gtk_button_new_with_label ("button1");
....

Thanks

Yanxin