Dynamically created image button click event is not fired

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ASP.NET

C#3.5

Gridview

On grid RowDataBound based on some condition i've added imagebutton dynamically. parallelly i want to add event for this button click. here is my code snippet

protected void GV3_RowDataBound(object sender, GridViewRowEventArgs e)
    {
if (e.Row.RowType == DataControlRowType.DataRow)
            {
                TableCell cell = new TableCell();
                ImageButton bttn = new ImageButton();
                bttn.CommandName = "Delete";
                bttn.ImageUrl = "delete.png";
                bttn.ToolTip = "Click to delete this record";
                bttn.CommandArgument = e.Row.Cells[0].Text;
                cell.Controls.Add(bttn);
                e.Row.Cells.Add(cell);
                bttn.OnClientClick = "return confirm('Are you sure you to delete " + e.Row.Cells[0].Text + "?');";
}
}

That message popup box comes, but i'm unable to catch that click event. while click on a row i want to delete that row, so want to create event dynamically. for that i've used this following dynamic click event

bttn.Click += new ImageClickEventHandler(b_Click);

private void b_Click(object sender, EventArgs e)
    {
//delete record
}

but this above code also not working.

Please help me to solve this. Thanks in advance.