problem in export to spreadsheet option in Set Pf Status in ooalv using factory method

Hi Experts,

I am having as issue regarding export to spreadsheet menu in standard status that i have copied.

it is appearing as grayed out, but it is showing from where i had copied it.  I didn't get any solution regarding this issue please help me asap.

I have also tried to write it separately but it is in same condition, even i had tried to attach the push button in application toolbar it doesn't appear in application toolbar also.

Following is the code i have written for PF Status.

     TRY.
         CALL METHOD cl_salv_table=>factory
           IMPORTING
             r_salv_table = lo_alv
           CHANGING
             t_table      = git_final.
       CATCH cx_salv_msg INTO DATA(lv_msg).
         lv_string = lv_msg->get_text( ).
         MESSAGE lv_string TYPE lc_i.
       CATCH cx_salv_object_not_found INTO DATA(lv_onf_msg).
         lv_string = lv_onf_msg->get_text( ).
         MESSAGE lv_string TYPE lc_i.
     ENDTRY.
      DATA: lo_column TYPE REF TO cl_salv_column_table,
           lo_funcs  TYPE salv_t_ui_func.

     CALL METHOD lo_alv->set_screen_status(
         pfstatus = 'SALV_TABLE_STANDARD'
         report   = sy-repid ).