Gtk::TreeModelColumn<uint32_t> solo_state;
Gtk::TreeModelColumn<uint32_t> solo_isolate_state;
Gtk::TreeModelColumn<uint32_t> solo_safe_state;
Gtk::TreeModelColumn<uint32_t> solo_state;
Gtk::TreeModelColumn<uint32_t> solo_isolate_state;
Gtk::TreeModelColumn<uint32_t> solo_safe_state;