Radiobutton

Hi Experts,

I have a doubt on radiobutton display and activation.

I have two radiobutton groups.

PARAMETERS: p_file1 TYPE c RADIOBUTTON GROUP a,

p_date TYPE c RADIOBUTTON GROUP a.

PARAMETERS: p_pres TYPE c RADIOBUTTON GROUP b,

p_appl TYPE c RADIOBUTTON GROUP b.

I want.... if the user selects p_file1 then only radiobutton group b should get active/enabled.

If the user selects p_date radiobutton then the radiobutton group b should get disabled/inactive.

I was trying with loop at screen but its not working. May be I am missing out on something.

Please help.

Regards,

Sangeeta.

Points will be awarded generously for correct answer.