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);
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);