Ho to disabled the parameter on the selection screen

Hi all,
I have a parameter (p_matnr) and two radiobutton b1 and b2 on the selection screen. Now what the requirement is if user selects radio button b2, the parameter should get disabled. I know it can be done by loop at screen and then modifying the screen but in this case start-of-seection is to be called. In my case as the user selects the radio button b2 the parameter should be appear disabled. the code which is given below will work in that case where user selects the b2 and then press F8. Bu i don't want the user to pres F8. He will only select the b2 and will find the parameter (p_matnr) disabled.
Please suggest something.
AT SELECTION-SCREEN outpu.
IF b2 = 'X'.
LOOP AT SCREEN.
IF screen-name cs 'p1' .
screen-input = 0.
MODIFY SCREEN.
ENDIF.
ENDLOOP.
ENDIF.
Thanks,
Annup.

Hi,
Try this i have used this in my code
SELECTION-SCREEN BEGIN OF BLOCK b_0 WITH FRAME TITLE text-002.
SELECTION-SCREEN BEGIN OF BLOCK b_1 WITH FRAME TITLE text-000.
PARAMETERS:      rb_img    RADIOBUTTON GROUP rad1 user-command rad.
PARAMETERS:      rb_invo   RADIOBUTTON GROUP rad1.
SELECTION-SCREEN BEGIN OF BLOCK b_2 WITH FRAME TITLE text-001.
*PARAMETERS:      rb_img    RADIOBUTTON GROUP rad1.
PARAMETERS:      p_from    like bkpf-bldat modif id gr2,
                 p_to      like bkpf-bldat modif id gr2.
SELECT-OPTIONS: s_arobj FOR   toa01-ar_object modif id gr2.
SELECTION-SCREEN END OF BLOCK b_2.
SELECTION-SCREEN BEGIN OF BLOCK b_3 WITH FRAME TITLE text-001.
*PARAMETERS:      rb_invo   RADIOBUTTON GROUP rad1.
SELECT-OPTIONS: s_bukrs   FOR bkpf-bukrs modif id gr1,
                 s_belnr   FOR bkpf-belnr modif id gr1,
                 s_gjahr   FOR bkpf-gjahr modif id gr1,
SELECTION-SCREEN END OF BLOCK b_3.
SELECTION-SCREEN END OF BLOCK b_0.
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
    IF screen-group1 = 'GR1'.   "Name field
      IF rb_invo = space.
        screen-active = 0.
      ELSE.
        screen-active = 1.
      ENDIF.
      MODIFY SCREEN.
    ELSEIF screen-group1 = 'GR2'.
      IF rb_invo = c_x.
        screen-active = 0.
      ELSE.
        screen-active = 1.
      ENDIF.
      MODIFY SCREEN.
    ENDIF.
ENDLOOP.
START-OF-SELECTION.
Thanks & Regards,
Judith.

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