F4_FILENAME in search help in screen painter

Question

Hello gurus,
I want to design a screen in which the text input field is used to get file name. For that i need to enable file search in local folders and drives with f4 key press. I wish to use the functionality of function module 'F4_FILENAME" in screen painter. How can i do that?
I tried creating search help for RLGRAP structure. It compiles fine but gives the message 'No inout for selection'.
What should i do?

Answer 1

Thank you all,
The problem has been solved.
I am posting the final code.
1. In se38, i created program zprogram.
2. In se51, i created a screen for the program zprogram.
3. In layout, i took 2 buttons and one input/output field.
1st button for import and 2nd button for exit.
4.In flow logic-
i wrote the follwing code.
PROCESS BEFORE OUTPUT.
MODULE STATUS_100.
PROCESS AFTER INPUT.
PROCESS ON VALUE-REQUEST.
FIELD FILENAME1 MODULE F4_FILE_SEARCH.
5. IN THE MAIN PROGRAM
i wrote the following code-
REPORT ZPROGRAM.
DATA: FILENAME1 TYPE RLGRAP-FILENAME,
           OK_CODE TYPE SY-UCOMM.
CALL SCREEN 100.
MODULE F4_FILE_SEARCH INPUT.
OK_CODE = SY-UCOMM.
CALL FUNCTION 'F4_FILENAME'
EXPORTING
    FIELD_NAME         = 'FILENAME1'
IMPORTING
    FILE_NAME           = FILENAME1
ENDMODULE.
MODULE STATUS_100 OUTPUT.
CASE OK_CODE.
WHEN 'IMPORT'.
MESSAGE 'THE FILE IS RECIEVED' TYPE 'I'.
WHEN 'CANCEL'.
LEAVE PROGRAM.
ENDCASE.
ENDMODULE.
I REFERRED TO THE DEMO PROGRAM MENTIONED
IN OTHER POST
NAME OF THE DEMO PROGRAM IS - DEMO_DYNPRO_F4_HELP_MODULE