ItemDataBound not Firing on Repeater

I have a user control that comprises a Repeater that builds a vertical table
of buttons.  In the Page_Load event of the user control I bind an event
handler, but the event never fires.  My code is like this:



        protected void Page_Load(object sender, EventArgs e)

        {

            rptPageButtons.ItemDataBound += new
RepeaterItemEventHandler(rptPageButtons_ItemDataBound);

        }



        void rptPageButtons_ItemDataBound(object sender,
RepeaterItemEventArgs e)

        {

            throw new Exception("The method or operation is not
implemented.");

        }



However, if I use the OnItemDataBound attribute, the event fires.  Why could
this be?


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