Alv Grid Layout Save Button erscheint nicht

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FORM pbo.
  SET PF-STATUS 'STATUS100'.
  SET TITLEBAR 'TITLE100' WITH g_partner.
  IF g_custom_container IS INITIAL.
    CREATE OBJECT g_custom_container
      EXPORTING
        container_name = g_container.

    CREATE OBJECT g_grid
      EXPORTING
        i_parent = g_custom_container.

    gs_layout-zebra = abap_true.
    gs_layout-cwidth_opt = abap_true.

    CALL METHOD g_grid->get_frontend_fieldcatalog
      IMPORTING
        et_fieldcatalog = gt_fieldcat.

    CALL FUNCTION 'LVC_VARIANT_SELECT'
      EXPORTING
        i_dialog            = space
        i_user_specific     = 'X'
        it_default_fieldcat = gt_fieldcat
      IMPORTING
        et_fieldcat         = gt_fieldcat
        et_sort             = gt_sort
        et_filter           = gt_filter
      CHANGING
        cs_variant          = gs_variant
      EXCEPTIONS
        OTHERS              = 6.

    IF sy-subrc = 0.
      CALL METHOD g_grid->set_variant( gs_variant ).
      CALL METHOD g_grid->set_frontend_fieldcatalog( gt_fieldcat ).
    ENDIF.

    CALL METHOD g_grid->set_table_for_first_display
      EXPORTING
        i_structure_name = 'ZDSGVO_STR_OUTPUT'
        is_layout        = gs_layout
        is_variant       = gs_variant
        i_save           = 'U'
        i_default        = 'X'
      CHANGING
        it_outtab        = gt_output.

    CREATE OBJECT gr_event_receiver.
    SET HANDLER gr_event_receiver->handle_user_command FOR g_grid.
    SET HANDLER gr_event_receiver->handle_toolbar FOR g_grid.

    CALL METHOD g_grid->set_toolbar_interactive.

    CALL METHOD cl_gui_control=>set_focus
      EXPORTING
        control = g_grid.
  ENDIF.
ENDFORM.                    "pbo