CLASS lcl_event_handler DEFINITION . PUBLIC SECTION . METHODS: .... .... on_f4 FOR EVENT onf4 OF cl_gui_alv_grid IMPORTING e_fieldname es_row_no er_event_data et_bad_cells e_display. .... ENDCLASS. For the implementation part, code can be as follows: CLASS lcl_event_handler IMPLEMENTATION . ..... ..... METHOD on_f4. PERFORM on_f4 USING e_fieldname es_row_no-row_id er_event_data et_bad_cells e_di..