cl_salv_table

TRY.
    CALL METHOD cl_salv_table=>factory
      IMPORTING
        r_salv_table = gr_salv_table
      CHANGING
        t_table      = gt_itab.
  CATCH cx_salv_msg .
ENDTRY.

CALL METHOD gr_salv_table->set_screen_popup
  EXPORTING
    start_column = 1
    end_column   = 100
    start_line   = 1
    end_line     = 20.

gr_salv_table->display( ).