Problem in underline accelerator gtk1.2

["DC A" <adc4444 hotmail com>]

I'm trying to implement underline and shortcut accelerator on a gtk1.2 
application. After compilation shortcut accelerator works fine but when i 
run the program and press 'F' for "_File", the pulldown menu for File 
doesn't come up. I can see the underline beneath the letter 'F' though. Can 
anyone kindly give insight about what I am doin' wrong? Thanks.




  GtkWidget *file_menu_item, *exit_item, *help_menu_item, *about_item;
  GtkAccelGroup *accel_group, *file_accel_group, *help_accel_group;
  guint key_file, key_exit, key_help, key_about;

  .........
  file_menu_item = gtk_menu_item_new_with_label("");
  exit_item = gtk_menu_item_new_with_label("");

  help_menu_item = gtk_menu_item_new_with_label("");
  about_item = gtk_menu_item_new_with_label("");
  ........

  accel_group = gtk_accel_group_new();
  gtk_accel_group_attach(accel_group, GTK_OBJECT(top_window));


  file_accel_group = 
gtk_menu_ensure_uline_accel_group(GTK_MENU(file_menu));
  help_accel_group = 
gtk_menu_ensure_uline_accel_group(GTK_MENU(help_menu));


  key_file = 
gtk_label_parse_uline(GTK_LABEL(GTK_BIN(file_menu_item)->child), "_File");
  key_exit = gtk_label_parse_uline(GTK_LABEL(GTK_BIN(exit_item)->child), 
"_Exit");
  key_help = 
gtk_label_parse_uline(GTK_LABEL(GTK_BIN(help_menu_item)->child), "_Help");
  key_about = gtk_label_parse_uline(GTK_LABEL(GTK_BIN(about_item)->child), 
"_About Us");

  ........

  gtk_widget_add_accelerator(exit_item, "activate", accel_group, 'Q', 
GDK_CONTROL_MASK, GTK_ACCEL_VISIBLE);
  gtk_widget_add_accelerator(about_item, "activate", accel_group, 'A', 
GDK_CONTROL_MASK, GTK_ACCEL_VISIBLE);


  gtk_widget_add_accelerator(file_menu_item, "activate", file_accel_group, 
key_file, GDK_NONE, GDK_NONE);
  gtk_widget_add_accelerator(exit_item, "activate", file_accel_group, 
key_exit, GDK_NONE, GDK_NONE);
  gtk_widget_add_accelerator(help_menu_item, "activate", help_accel_group, 
key_help, GDK_NONE, GDK_NONE);
  gtk_widget_add_accelerator(about_item, "activate", help_accel_group, 
key_about, GDK_NONE, GDK_NONE);

  ........

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