[gtkmm] Menu destructor problems.

I am working on porting my gtkmm 1.2.x program to 2.2.0. I was getting
weird errors while closing a dialog box and I've tracked it down to the
option menu that I have in the dialog box. Here are the errors I am
getting with my program:

(lt-color_dialog_test:1070): GLib-GObject-WARNING **: instance of
invalid non-instantiatable type `<invalid>'

(lt-color_dialog_test:1070): GLib-GObject-CRITICAL **: file gsignal.c:
line 2300 (g_signal_handlers_disconnect_matched): assertion
`G_TYPE_CHECK_INSTANCE (instance)' failed

(lt-color_dialog_test:1070): Gtk-CRITICAL **: file gtkoptionmenu.c: line
247 (gtk_option_menu_detacher): assertion `GTK_IS_OPTION_MENU (widget)'

The third error is what helped me track this down to the option menu. I
have been playing with this for a while and I have come up with a small
program that mostly creates this error. The first two messages above are
printed out, but the third is not. It seg-faults before getting that
far. At first the test program ran fine, and I couldn't figure out why
it worked but my application doesn't. Then I changed from packing menu
items into the menu by using the append function to instead using the
push_back function of Gtk::Menu::MenuList. Now I see the errors with my
test program.

My application uses the append function and it gives the errors, by
switching to the push_back function it also gives the same errors. Below
is a backtrace after running the example program in gdb:

#0  0x405f8aae in g_data_set_internal () from /usr/lib/libglib-2.0.so.0
#1  0x405f8de3 in g_datalist_id_set_data_full () from
#2  0x405c1d45 in g_object_real_dispose () from
#3  0x4034b6bb in gtk_object_dispose () from
#4  0x403e4be5 in gtk_widget_dispose () from
#5  0x4017898b in Gtk::Widget_Class::dispose_vfunc_callback(_GObject*)
() from /usr/lib/libgtkmm-2.0.so.1
#6  0x405c1def in g_object_last_unref () from
#7  0x4013f419 in Gtk::Object::_destroy_c_instance() () from
#8  0x4013f6a4 in Gtk::Object::destroy_() () from
#9  0x4013914b in Gtk::MenuItem::~MenuItem() () from
#10 0x0804cf40 in ~test_window (this=0xbffff6a0) at
#11 0x0804cd17 in main (argc=1, argv=0xbffff7d4) at
#12 0x40751a44 in __libc_start_main () from /lib/libc.so.6

And here is the example program:

#include <gtkmm/optionmenu.h>
#include <gtkmm/menu.h>
#include <gtkmm/window.h>
#include <gtkmm/main.h>

class test_window : public Gtk::Window
  Gtk::OptionMenu some_menu;
  Gtk::MenuItem menu_one, menu_two;
  Gtk::Menu the_menu;

: menu_one("One"), menu_two("Two")
  Gtk::Menu_Helpers::MenuList& menulist=the_menu.items();
//    the_menu.append(menu_one);
//    the_menu.append(menu_two);

int main(int argc, char *argv[])
  Gtk::Main main_runner(argc, argv);
  test_window foo;

The program crashes when you close the window. If you uncomment the two
append functions and comment out the push_back functions the program no
longer exhibts this error.

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