how to hide subscreen in module pool

hello expert.

i created one Box, and inside box i created one subscreen in Module pool ->layout.and two radio button out side of the Box.

if i select 2nd radio button , want to hide subscreen.

how to hide subscreen. could you please send me the solution asap , it's urgent.

i written below code but not working.

LOOP AT SCREEN.

IF rad2 Eq 'X'

IF SCREEN-NAME = 'SUB1' .

SCREEN-INPUT = 0.

SCREEN-INVISIBLE = 1.

MODIFY SCREEN.

ENDIF.

ENDIF.

ENDLOOP.

Regards

srinivas