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OnItemCommand not working with ImageButton and OK with LinkButton

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I have a Template column with 2 imagebuttons and 1 linkbutton.
The OnItemCommand handler defined on the DataGrid control is not fired when
I click the imagebuttons, but works perfectly with the linkbutton.
I'm posting the code so someone can take a look and hopelfully has an idea
of what I'm doing wrong. Thank you!

PS: the dtagagrid is on a UserControl, i'm posting the code for the user
PS2: to wire the handler, I used both approaches, via HTML OnItemCommand
defined on the datagrid's HTML code and I added a "Handles
controlName.ItemCommand" to the OnItemCommand handler signature on the VB
PS3: note the CommandName and CommandArgument defined for each control.

<asp:datagrid id="dtgPendientes" runat="server" BorderColor="#999999"
BorderStyle="None" BorderWidth="1px" BackColor="White" CellPadding="3"
AllowSorting="True" AutoGenerateColumns="False"
<asp:ImageButton id=imbDetail runat="server" Tooltip="Ver Detalle"
CommandArgument='<%# Container.DataItem("in_tkt_code")%>'
CommandName="Detail" Width="16px" Height="16px"
<asp:ImageButton id=imbClose runat="server" Tooltip="Cancelar Incidente"
CommandArgument='<%# Container.DataItem("in_tkt_code")%>' CommandName="Close"
Width="16px" Height="16px"
<asp:LinkButton id="LinkButton1" runat="server" CommandArgument='<%#

ctrlPending.ascx.vb (the code behind for the control)
Sub dtgPendientes_Procesar(ByVal objSender As Object, ByVal objArgs As
DataGridCommandEventArgs) Handles dtgPendientes.ItemCommand
End Sub

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