Triger the event in DataGrid when changing occur in TemplateColumn(asp:radiobuttonlist)

To get the row index of DataGrid when change(asp:radiobuttonlist) occur in row of the TemplateColumn

<asp:DataGrid ID="dgTier2" runat="server" AutoGenerateColumns="False" Width="578px" 
      Height="83px" OnItemDataBound="dgTier2_ItemDataBound">
     <asp:BoundColumn  DataField="TypeID" HeaderText="TypeID">
     </asp:BoundColumn>
     <asp:BoundColumn  DataField="Type" HeaderText="Category Type">
     </asp:BoundColumn>
      <asp:TemplateColumn HeaderText="Manual Tracking Option" >
       <ItemStyle VerticalAlign="Bottom" />
        <itemtemplate>
         <asp:radiobuttonlist id="rdbtnManual" runat="server" on RepeatDirection="Horizontal">
         <asp:listitem id="M"  runat="server" Text="Manual" Value="1" />
         <asp:listitem id="A"  runat="server" Text="NoManual" Value="0" />
      </asp:radiobuttonlist>
      </itemtemplate>
      </asp:TemplateColumn>
      </asp:DataGrid>
 

After changing the rediobutton selection to get the Rowindex of the changed row.if at all change happens in many rows i need make the collection of the Rowindexs.Is that passible.

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