Module pool

Hai,

I developed this code in selection screen, but i need same output in module pool, how i can do it, which event i should use in module pool. If any one know tell me.

PARAMETERs: male RADIOBUTTON GROUP grp1 USER-COMMAND SHOWTEXT,

female RADIOBUTTON GROUP grp1,

text type text30.

AT SELECTION-SCREEN.

if sy-ucomm eq 'SHOWTEXT'. "check the user-command

if male eq 'X'.

text = 'Male option was selected.'.

elseif female eq 'X'.

text = 'Female option was selected.'.

endif.

endif.