CompositeControl: ambiguous GetContents error message, test inheritance #1715
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According to #1613 CompositeControl do not work with both base and derived types defining GetContents method. I could not replicate that, the provided example works for me, maybe it was fixed accidentally.
In the issue, I mentioned that it would be complex to handle potential redefinition or "removal" of properties in the derived type. That isn't really the case, both cases don't need any special code
Resolves #1613