Hi,
Another mysterious flag is:
DATA: st_layout TYPE lvc_s_layo ,
st_layout-no_rowins = abap_true ."Block ctrl enter .
CALL METHOD ob_gui_alv_grid_1->set_table_for_first_display
EXPORTING
it_toolbar_excluding = it_toolbar_excluding
is_layout = st_layout
is_print = st_print
i_save = 'A'
is_variant = gs_disvariant_1
CHANGING
it_sort = it_sort
it_fieldcatalog = it_fieldcatalog
it_outtab = it_alv_grid_a.
Regards.