Enable F8 function ( execute )

Hi Experts,

I am able to disable the F8 function key using the FF code:

gv_ucomm = 'ONLI'.

APPEND gv_ucomm TO gt_ucomm.

CLEAR gv_ucomm.

CALL FUNCTION 'RS_SET_SELSCREEN_STATUS'

EXPORTING

p_status = sy-pfkey

* P_PROGRAM = ' '

TABLES

p_exclude = gt_ucomm.

Question:

How do I ENABLE it again in my program?

Thanks!

Carl