F4 symbol

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hai friends,

After designing my sel-screen, For one radio button i am not getting the F4 symbol at the end of my text box.of-course F4 functionality is working when i double click on my radui button.but as it's not a feasible solution.anybody have solution for this.if u want check my code also.

SELECT-OPTIONS : s_date FOR ztbukxxin003-z_manufdate NO-EXTENSION.

SELECTION-SCREEN BEGIN OF BLOCK blk1 WITH FRAME TITLE text-006.

PARAMETERS : p_rad1 RADIOBUTTON GROUP rad1.

PARAMETERS : p_file LIKE rlgrap-filename.

PARAMETERS : p_rad2 RADIOBUTTON GROUP rad1 DEFAULT 'X'.

PARAMETERS : p_lopath LIKE filename-pathintern.

PARAMETERS : p_lofile LIKE filename-fileintern DEFAULT 'ZTBUKXXIN008'

.

SELECTION-SCREEN END OF BLOCK blk1.

AT SELECTION-SCREEN.

PERFORM validate.

*AT SELECTION-SCREEN ON VALUE-REQUEST FOR p_file.

IF p_rad1 EQ 'X'.

PERFORM get_local_file USING p_file.

ELSEIF p_rad2 EQ 'X'.

PERFORM get_appl_file USING p_lofile.

ENDIF.

the code for perform local file is

CALL FUNCTION 'WS_FILENAME_GET'

EXPORTING

DEF_FILENAME = p_file

def_path = 'C:\'

mode = ' '

IMPORTING

filename = p_file

EXCEPTIONS

inv_winsys = 1

no_batch = 2

selection_cancel = 3

selection_error = 4

OTHERS = 5.

Note : Here the reason for commenting the line atsel-screen on value-request is bcz the cursor is not going forward if i select the application server button