How to remove item from tree?

["Mee Com" <writemessage hotmail com>]

Hi!
         I create a tree  and attach on a table like this........
/* Create the root tree */
  tree = gtk_tree_new ();

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

  gtk_table_attach_defaults(GTK_TABLE(table), tree, 0,5, 0, 4);

  /* connect all GtkTree:: signals */
  /* Create button click for remove item */

  button = gtk_button_new_with_label("Remove Item(s)");
  gtk_widget_set_sensitive(button, TRUE);
  g_signal_connect (button, "clicked",
		    G_CALLBACK (cb_remove_item),
		    tree);

  gtk_table_attach_defaults (GTK_TABLE (table), button, 0, 5, 6, 8);

  gtk_widget_show(button);
  tree_buttons->remove_button = button;

and I use the function "cb_remove_item" as show on testgtk.c in 
gtk+-2.2.4.zip package like this...

cb_remove_item(GtkWidget*w, GtkTree* tree)
{
  GList* selected_list;
  GList* clear_list;

  selected_list = GTK_TREE_SELECTION_OLD(tree);

  clear_list = NULL;

  while (selected_list)
    {
      clear_list = g_list_prepend (clear_list, selected_list->data);
      selected_list = selected_list->next;
    }

  clear_list = g_list_reverse (clear_list);
  gtk_tree_remove_items(tree, clear_list);

  g_list_free (clear_list);
}

when I click this button,why it still can't remove the member of the tree.
I kept the member of the tree(I mean the item) in an array like this ......
static gchar *onlinenames[] = {"Mee", "John"}
but it still can't remove any of names from the tree when I click this 
button.

Thanks for all of your advise!
Regards,

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