How to find out each row in datagrid after paging in silverlight

Question

Hi,

I generated one question paper with datagrid in silverlight. i done paging with datapager control. now i am displaying 5 questions per page. now i selected answer ie radiobutton for each question .now i want to find out which question is selected in that datagrid.can anybody please help me.


Thanks
P.Nagaraju