add_subwindow(scale_factor = new ProxyMenu(mwindow, this, x, y, popupmenu_w, ""));
scale_factor->update_sizes();
x += scale_factor->get_w() + margin;
add_subwindow(scale_factor = new ProxyMenu(mwindow, this, x, y, popupmenu_w, ""));
scale_factor->update_sizes();
x += scale_factor->get_w() + margin;