asp.net grid RowDeleting event

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ASP.NET

hello ,

I have a problem .
At my page there is a grid with columns like

<asp:CommandField ButtonType="Image"  NewImageUrl="~/images/new1.JPG" ShowInsertButton="True" />
        <asp:CommandField ButtonType="Image"  EditImageUrl="~/images/update1.JPG" ShowEditButton="True" />
        <asp:CommandField ButtonType="Image"  DeleteImageUrl="~/images/delete1.JPG" ShowDeleteButton="True" />

I want to used RowCommand event.It is ok for Insert & Update process
but not enough for Delete.
If I dont add RowDeleting event my page has error at runtime when trying delete a row.When I add RowDeleting event (even if it is empty)
page works fine.
Do I have to add RowDeleting event when I have ShowDeleteButton .