bool Union::on_button_press_event(GdkEventButton *event)
{
- int w,h;
if ((event->type == GDK_BUTTON_PRESS) && (event->button == 2 )){
image = null;
image->render_to_drawable(get_window(),get_style()->get_black_gc(),0,0,0,0,image->get_width(),image->get_height(),Gdk::RGB_DITHER_NONE,0,0);