How to do dynamic screen changes in TMG

Hi all,

I have a requirement that I have a table with 5 fields in that one is check box.
When I click on check box in TMG other should be deselected and user press save button, only selected record should be processed to my fm.

I used in PBO  loop at screen , but no changes done. Please give some starting.

Thanks in advance.

Regards,|
Mithuunn