bn_start->set_callback(goatkit::EV_CLICK, bn_handler, (void*)BN_START);
ui.add_widget(bn_start);
bn_exit = new goatkit::Button;
bn_exit->set_position(xpos, ypos += vsep);
bn_exit->set_size(bnwidth, bnheight);
bn_start->set_callback(goatkit::EV_CLICK, bn_handler, (void*)BN_START);
ui.add_widget(bn_start);
bn_exit = new goatkit::Button;
bn_exit->set_position(xpos, ypos += vsep);
bn_exit->set_size(bnwidth, bnheight);