toggletoolbutton label leak?

[Balazs Scheidler <bazsi balabit hu>]

Hi,

Sorry If I'm missing something obvious, but I'm a newbie in both Gtkmm
and Gtk+.

I'm trying to generate toolbar entries dynamically, basically I want a
nautilus like history bar, using Gtk::ToggleToolButtons to represent
nodes in my tree.

Thus whenever a node is selected I'm updating the toolbar with the
following code:

Gtk::ToolItem *
MainWindow::new_history_button(const std::string &text) const
{
  Gtk::ToggleToolButton *b;
  Gtk::Label *label;

  label = Gtk::manage(new Gtk::Label());
  label->set_use_markup(true);
  label->set_label(text);
  label->show();

  b = Gtk::manage(new Gtk::ToggleToolButton());
  b->set_label_widget(*label);
  b->set_homogeneous(false);
  b->show();
  return b;
}

void
MainWindow::update_history_bar(const Glib::RefPtr<Component> &last_shown)
{
  Glib::RefPtr<Component> p;
  Gtk::ToolItem *item;

  // free previous toolbar buttons
  while (history_bar->get_n_items() > 0)
    {
      item = history_bar->get_nth_item(0);
      if (item)
        {
          history_bar->remove(*item);
          delete item;
        }
    }

  // build new buttons
  p = last_shown;
  while (p->get_parent())
    {
      item = new_history_button(p->name);
      static_cast<Gtk::ToggleToolButton *>(item)->signal_toggled().connect(sigc::mem_fun(*this, &MainWindow::on_history_button_pressed));
      
      history_bar->prepend(*item); 
      p = p->get_parent();
    }
}

My problem is that, according to valgrind, new_history_button() function
leaks all Gtk::Label instances regardless if I'm using Gtk::manage() on 
instance creation or not. 

The funny part is that the Gtk::ToggleToolButton instances are not
leaked. So as it seems Gtk::ToggleToolButton fails to free the label
attached using set_label_widget()

What am I missing here?

-- 
Bazsi