quick_btn_new->signal_clicked().connect(SigC::slot(*this, &Constructor::on_quick_btn_new_clicked));
quick_btn_save->signal_clicked().connect(SigC::slot(*this, &Constructor::on_quick_btn_save_clicked));
quick_btn_open->signal_clicked().connect(SigC::slot(*this, &Constructor::on_main_menu_open));
quick_btn_new->signal_clicked().connect(SigC::slot(*this, &Constructor::on_quick_btn_new_clicked));
quick_btn_save->signal_clicked().connect(SigC::slot(*this, &Constructor::on_quick_btn_save_clicked));
quick_btn_open->signal_clicked().connect(SigC::slot(*this, &Constructor::on_main_menu_open));