Query regarding Expand all functionality in hier seq list.

Hello Every body,
Application: I am displaying a list(Hier seq) using cl_salv_hierseq_table method.
Important peices of code:-
cl_salv_hierseq_table=>factory(
EXPORTING
    t_binding_level1_level2 = gt_binding
IMPORTING
    r_hierseq = gt_table
CHANGING
    t_table_level1 = gt_final_h
    t_table_level2 = gt_final_i ).
*... set expand column
gt_columns->set_expand_column( 'EXPAND' ).
*... set items expanded
gt_level = gt_table->get_level( 1 ).
gt_level->set_items_expanded( ).
*register to the event on_user_command
SET HANDLER gt_events->on_user_command FOR lt_events.
Here i had added Refresh button in the application toolbar of the above ALV which is not in the standard one.
        PERFORM refresh_list_info USING e_salv_function.
        inside this perform the main peice of code is:
        gt_table->refresh( ).             "Refresh: Rebuilds the display list.
QUERY: The first display show all the header and items records as expanded by default.
              when i am trying to refresh the list, its displaying me the list with updated data in it
             properly BUT the only problem is the items are closed by default after refresh.
             so every time user needs to click the Expand option to view item records after refresh.
             Here I would like to have the items records expanded as well by default after Refresh.
             how to acheive this?
            Any suggestions to use any more methods or so..
           Your help will be highly appreciable.
Thanks,
Pavan.

check this document for reference:
https://www.sdn.sap.com/irj/scn/wiki?path=/display/profile/using%252bhierarchically%252b-sequential%252btable%252bfactory%252bmethod
cheers
Aveek

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