I've probably done this at least a dozen times, but when you don't do something everyday, you tend to forget. I created a custom control that I wanted to place into a control collection. So, I created the child control as a custom server control
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Read the complete post at http://weblogs.asp.net/jgaylord/archive/2008/03/31/allowing-a-server-control-to-contain-custom-child-collection.aspx