<obout:SuperForm ID="SuperForm1"
         runat="server"
         DataSourceID="SqlDataSource1"
         AutoGenerateRows="false">
        <Fields>
            <obout:TemplateField HeaderText="Country">
                <ItemTemplate>
                    <%# Eval("Country") %>
                </ItemTemplate>
                <EditItemTemplate>
                    <div style="height: 150px; overflow: auto; position: relative;">
                        <asp:RadioButtonList  runat="server" ID="Country"  DataSourceID="SqlDataSource2"
                         DataValueField="CountryID" DataTextField="CountryName" />
                    </div>
                </EditItemTemplate>
            </obout:TemplateField>
        </Fields>
</obout:SuperForm>