dock_main->addToolBar(main_bar.get());
session.set_main_bar(main_bar);
connect(main_bar.get(), SIGNAL(new_view(Session*)),
this, SLOT(on_new_view(Session*)));
dock_main->addToolBar(main_bar.get());
session.set_main_bar(main_bar);
connect(main_bar.get(), SIGNAL(new_view(Session*)),
this, SLOT(on_new_view(Session*)));