anchor.diff:                  it_query_table TYPE cnht_query_table   OPTIONAL
         EXPORTING
                   eo_page        TYPE REF TO lif_gui_page
  -                ev_result      TYPE i
  +                ev_state       TYPE i
         RAISING   lcx_exception.
   
     PRIVATE SECTION.
  
positive.code: CLASS lcl_gui_page_db_display DEFINITION FINAL INHERITING FROM lcl_gui_page_super.
  
    PUBLIC SECTION.
      METHODS lif_gui_page~on_event REDEFINITION.
      METHODS lif_gui_page~render   REDEFINITION.
  
      METHODS: constructor
  
negative.code:   METHOD on_event.
      CASE iv_action.
        WHEN 'home'.
          eo_page  = get_home_page( ).
          ev_state = gc_event_state-new_page.
        WHEN OTHERS.
          ev_state = gc_event_state-not_handled.
      ENDCASE.
    ENDMETHOD.        " on_event
  
  