int y1 = y + (window->get_h() - BC_Title::calculate_h(this, txt)) / 2;
add_subwindow(title1 = new BC_Title(x1, y1, txt));
x1 += title1->get_w() + margin;
int y1 = y + (window->get_h() - BC_Title::calculate_h(this, txt)) / 2;
add_subwindow(title1 = new BC_Title(x1, y1, txt));
x1 += title1->get_w() + margin;