- if (!has_interface_b ())
- {
- elt_l_->set_elt_property ("elements", SCM_EOL);
- elt_l_->set_elt_property ("transparent", SCM_BOOL_T);
- elt_l_->set_elt_property ("axes" , SCM_EOL);
- group (elt_l_, "interfaces").add_thing (ly_symbol2scm ("Axis_group"));
- }
+ Grob *me = unsmob_grob (smob);
+ return generic_group_extent (me, X_AXIS);