EXPERT RESPONSE
I would recommend making the second control a constituent control hosted on the first user control so that you would have access to the second user control from within the first. Just envision your control as being a .NET control such as the ListView and work with it just as you would if it were hosted upon a Form.
If I am missing the point of you question, and you are trying to embed separate controls in a Web page instead of building them into each other, perhaps passing a reference of the first to the second control using a method or property.
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