g_signal_connect (reg, "removed", G_CALLBACK (repopulate_windows_menu), menuitem);
g_signal_connect (reg, "inserted", G_CALLBACK (repopulate_windows_menu), menuitem);
g_signal_connect (reg, "removed", G_CALLBACK (repopulate_windows_menu), menuitem);
g_signal_connect (reg, "inserted", G_CALLBACK (repopulate_windows_menu), menuitem);