How to disable an I/O field at runtime of the screen

Hi Guru's,
Here's the scenario..I have to diable one I/O field in the screen at runtime. If I will click one radio button, one I/O field should be disalbed. How can I do that? Please help!! I'm doing a report program, do someone have an idea how to make this work?
Any help will be appriciated
Thanks and regards,
Mackoy

Hi Morris,
Still got no answer..here's my code below..
selection-screen begin of block scr01 with frame title text-001.
*& select options
select-options: ps_matnr for mara-matnr,            "Article
                      ps_date  for mkpf-budat obligatory. "Date
selection-screen  end of block scr01.
selection-screen begin of block scr02 with frame title text-002 no intervals.
parameters:  Site radiobutton group rb1,
                   Article radiobutton group rb1.
selection-screen end of block scr02.
*& Events
at selection-screen on radiobutton group rb1.
  if article = 'X'.
     loop at screen.
       if screen-name = 'PS_MATNR-LOW' and screen-name = 'PS_MATNR-HIGH'.
          SCREEN-INPUT = 0.
          screen-invisible = 0.
         MODIFY SCREEN.
       ENDIf.
     ENDLOOP.
     perform display_site.
endif.
thanks and regards,
Mackoy

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