HyperLinkField in GridView with multiple fields does not work

<asp:GridView ID="GV" runat="server" AutoGenerateColumns="False">

<Columns>    

<asp:HyperLinkField DataNavigateUrlFields="CAM,Floor,Riser" DataNavigateUrlFormatString="HorzHandover.aspx?CAM={0}&amp;Floor={1}&amp;Riser={2}"     Text="Handover"/>     

<asp:TemplateField>        

    <ItemTemplate>            

    <asp:HyperLink ID="HyperLink1" runat="server"  NavigateUrl='<%# "Export.aspx?CAM="+Eval("CAM")+"&Floor="+Eval("Floor")+"&Riser="+Eval("Riser") %>' Text="Signoff"></asp:HyperLink>            </ItemTemplate>

</asp:TemplateField>

</Columns>

</asp:GridView>

I think this is a bug in asp.net. HyperLinkField in GridViews with multiple fields do not seem to work at all. You have to turn column into a template to make it work (as shown above)