Selection-screen function key dynamically ?

Question

Dear all,
I wonder if it is possible to have a function key dynamically appearing on the selection screen of an ABAP. For example the button for reading the documentation of an ABAP is shown dynamically only if there is a documenation available.
I have tried several methods at SELECTION-SCREEN OUTPUT
- SET PF-STATUS EXCLUDING 'FC0x' : no reaction
- Blanking the icon via CLEAR: SSCRFIELDS-FUNCTXT: Result blank button
- In LOOP AT SCREEN nothing can be found concerning function keys.
I assume that the crucial point is the SELECTION-SCREEN FUNCTION KEY statement, which generates the button.
Thanx for your help
Rabanus Diehl

Answer 1

You mention about the 'Documentation' button.
However, SE38 is a dialog program so this why it is easy to do. You are writing a report program. You could have the pushbutton on the screen itseld instead of the status bar. You should then be able to use LOOP AT SCREEN to hide. Here is some code to put a pushbutton on a screen.
INCLUDE <list>.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN PUSHBUTTON 01(35) garment
  USER-COMMAND garment.
SELECTION-SCREEN END OF LINE.
INITIALIZATION.
  PERFORM f_setup_pushbutton_text USING icon_execute_object text-s01
                                  CHANGING garment.
FORM f_setup_pushbutton_text USING    p_icon
                                      p_text
                             CHANGING p_result.
  DATA: l_result(50).
  CALL FUNCTION 'ICON_CREATE'
       EXPORTING
            name                  = p_icon
            text                  = p_text
            add_stdinf            = space
       IMPORTING
            RESULT                = l_result
       EXCEPTIONS
            EXCEPTIONS
            icon_not_found        = 1
            outputfield_too_short = 2
            OTHERS                = 3.
  IF sy-subrc EQ 0. ENDIF.
  p_result = l_result.
ENDFORM.                               " F_SETUP_PUSHBUTTON_TEXT