In my custom collection I create a delegate for the CellInfoEventHandler when
each SimpleCell is added to the collection:

protected override void OnInsert(int index, object value)
        {
            SimpleCell cell = (SimpleCell) value;
            cell.OnClick += new CellInfoEventHandler(cell_OnClick);
            //base.OnInsert (index, value);
        }

I can debug and confirm that the SimpleCell exists and is added to the
collection but when I place a breakpoint on the SimpleCell overriden
SaveViewstate() and LoadViewstate() methods it never breaks into these
methods. Obviously the RegisterChildControls and RenderContents methods get
called as each SimpleCell is rendered on the design-time surface and in the
run-time aspx.

Note that I have a custom typeconverter for the SimpleCellCollection and the
SimpleCell. I have looked at the hidden Form values __EVENTTARGET and
__EVENTTARGET to view which SimpleCell has been clicked (essentially each is
an ImageButton). Any more ideas as to what is happening? Much thanks.