Activar evento DeleteCommand del Datagrid en ASP.NET

[RsOfT]

Código:

<asp:datagrid id="Grid" style="Z-INDEX: 104; LEFT: 176px; POSITION: absolute; TOP: 320px" runat="server" Width="456px" Height="120px" PageSize="5" AllowPaging="True" BorderColor="#CCCCCC" BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="3" AutoGenerateColumns="False" AllowSorting="True">
	<SelectedItemStyle Font-Bold="True" ForeColor="White" BackColor="#669999"> 		</SelectedItemStyle>
	<ItemStyle ForeColor="#000066"></ItemStyle>
	<HeaderStyle Font-Bold="True" ForeColor="Black" BackColor="#99CCFF"> </HeaderStyle>
	<FooterStyle ForeColor="#000066" BackColor="White"></FooterStyle>
	<Columns>
		<asp:BoundColumn DataField="usUsuario" HeaderText="Nombre de Usuario"></asp:BoundColumn>
		<asp:TemplateColumn HeaderText="Borrar Usuario">
			<ItemStyle HorizontalAlign="Center"></ItemStyle>
			<ItemTemplate>
				<asp:Button id="btnEliminar" runat="server" Text="  Eliminar  " CausesValidation="False" CommandName="Delete"></asp:Button>
			</ItemTemplate>
		</asp:TemplateColumn>
	</Columns>
	<PagerStyle NextPageText="&gt;" PrevPageText="&lt;" HorizontalAlign="Left" ForeColor="#000066" BackColor="White"></PagerStyle>
</asp:datagrid>

Este es mi DataGrid!!!