Change layout of ALV tree programmatically

Question

I want to change the layout of a cl_gui_alv_tree programmatically. My current approach is not working. This is my code so far, executed in screen's PBO:

  CALL METHOD gs_0700-s_tree-r_tree->delete_all_nodes
    EXCEPTIONS
      failed            = 1
      cntl_system_error = 2
      OTHERS            = 3.
  IF sy-subrc <> 0.
    MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
      WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
  ENDIF.

  PERFORM load_new_tree_nodes.

  ls_vari-report   = gs_0700-repid.
  ls_vari-handle   = 'TREE'.
  ls_vari-variant  = '/new_variant'

  (...)

  CALL METHOD gs_0700-s_tree-r_tree->set_variant_key
    EXPORTING
      is_variant = ls_vari.

  CALL METHOD gs_0700-s_tree-r_tree->column_optimize.
  CALL METHOD gs_0700-s_tree-r_tree->update_calculations.

  CALL METHOD gs_0700-s_tree-r_tree->frontend_update.

The tree is redrawn and new nodes are loaded. Even the columns get optimized. Everything changes but not the layout variant. It looks always like /default layout variant I set with the set_table_for_first_display method during init of the tree. I created the variant /new_variant and I can load it via the toolbar.

Is there some other way to change the layout variant of a tree programmatically?

Answer 1

Do you call SET_TABLE_FOR_FIRST_DISPLAY method with parameter I_DEFAULT = space ?

Default setting will be 'X' which results in always displaying the default variant.