how to implement imagebuttons OnClick event handler at runtime in ASP.net with C# .net 1.1

Hi,
I am populating ImageButton Controls in my webpage at the run time. I tried to call ImageClickEventHandler to raise the onclick event, whenever the ImageButton is clicked. But the event is not getting fired.
 
Could anyone please help me on how to raise the event for the Imagebuttons at the runtime.
 
Thanks,
Suresh
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