Show blank Lines in OOP ALV

Hello Gurus,

     I am stuck with a very small problem. I have a internal table which might have some INITIAL LINES in it. I am using this internal table in the ALV Method. CALL METHOD o_alv->set_table_for_first_display.

     But, during the final display of the ALV display, all the blank lines are getting deleted automatically, which I don't want. I have modified and rechecked some fields like, l_sort-up = 'X' or Space. but, nothing solved my problem.

     Can you please help me with identifying the exact parameter, which will enable thr ALV to show blank lines in the final display.

Thanks for the help in advance.