[DotNetDevelopment] Why won't my Header Text display?

[stapes]

Using ASP.NET with C#.
The header for this GridView column refuses to show. What am I
missing?

<asp:TemplateField HeaderText="Select" ShowHeader="true">
                    <ItemTemplate>
                       <asp:CheckBox ID="chkSelect" runat="server" />
                    </ItemTemplate>
                   </asp:TemplateField>