REGISTER_CALLBACK (serv, "/select/expand", "i", sel_expand);
REGISTER_CALLBACK (serv, "/select/pan_elevation_position", "f", sel_pan_elevation);
REGISTER_CALLBACK (serv, "/select/pan_frontback_position", "f", sel_pan_frontback);
REGISTER_CALLBACK (serv, "/select/expand", "i", sel_expand);
REGISTER_CALLBACK (serv, "/select/pan_elevation_position", "f", sel_pan_elevation);
REGISTER_CALLBACK (serv, "/select/pan_frontback_position", "f", sel_pan_frontback);