Scrollbar?

["Mee Com" <writemessage hotmail com>]

Why can't add scrollbar to hbox nor table while using "tree widget"?
I create vbox for use in Pane widget like this......

hbox9 = gtk_vbox_new (FALSE, 0);
 gtk_container_add (GTK_CONTAINER (frame1), hbox9);
 gtk_widget_show (hbox9);

and create table ,then add to this vbox , like this .....

 table = gtk_table_new (8, 8, FALSE);
 gtk_container_add (GTK_CONTAINER (hbox9), table);
gtk_widget_show(table);

and I add tree in this table.............

/* Just add tree */
/* A generic scrolled window */
 scrolled_win = gtk_scrolled_window_new (NULL, NULL);
 gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win),
                                  GTK_POLICY_AUTOMATIC,
                                  GTK_POLICY_AUTOMATIC);
// gtk_widget_set_size_request (scrolled_win, 10, 20);

     gtk_container_add (GTK_CONTAINER (table), scrolled_win);
 gtk_widget_show_all (scrolled_win);

 /* Create the root tree */
 tree = gtk_tree_new ();

But I really don't understand that why the output didn't show any of 
scrollbar???? why????
Although I change the code to only use BOX Container without use Table 
Container,it still can't create any of scrollbar,it only create the tree 
without scrollbar..............why?
Thanks for all of your advise!
Regards,

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