btn->set_tooltip("Export layout as SVG (V)");
btn->signal_clicked.connect(sigc::mem_fun(&designer, &Designer::svg_export));
pnl_content->add(*(btn = new GLtk::Button("Quit")));
btn->set_tooltip("Export layout as SVG (V)");
btn->signal_clicked.connect(sigc::mem_fun(&designer, &Designer::svg_export));
pnl_content->add(*(btn = new GLtk::Button("Quit")));