OnCommand Event not firing!

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C#

ASP.NET

Gridview

Hi for everyone! I have a problem with a itemtemplate in a gridview, i have 3 ImageButton and one method that called Img_Command here´s my asp.net code:

<asp:TemplateField>">

   <ItemTemplate>

   <asp:ImageButton ID="imgBtnUpload" OnCommand="Img_Command" CommandName="Upload" 
   ToolTip="Enviar PDA – PDR" ImageUrl="~/Images/APUpload.png" Visible="true" runat="server"/>

   <asp:ImageButton ID="imgBtnProcessado" OnCommand="Img_Command" CommandName="Processado" ToolTip="Lote já processado!" ImageUrl="~/Images/loteProcessado.png"   Visible="false"runat="server"/>

   </ItemTemplate>

</asp:TemplateField>">

and here´s my code behind:

protected void Img_Command(object sender, CommandEventArgs eArgs)
        {
            GridView gdv = (GridView)sender;
            switch (eArgs.CommandName)
            {
                case "Atualizar":
                    break;
                case "Upload":
                    BtnUpload(0);
                    break;
                case "Processado":
                    break;
            }

        }

Why the OnCommand event is not firing?

Any suggest?

Thanks!