XCode: How can I use dictionary controllers for 2 dict's with a common key?

I have two dictionaries, both with the same key. Using Interface Builder I can build for each dictionary a two-column table, but I did not find out how to connect their keys so that selecting a line in one table automatically selects the corresponding line in the other table.
Does there exist a binding between the two controllers that solves the problem? If so, how can it be established?
(First I tried to use only ONE table - with 3 columns. This appeared to me the best way. But again I could not establish the appropriate binding.)

Hans,
You may want to post your question in the following group.
http://discussions.apple.com/forum.jspa?forumID=727

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XCode: How can I use dictionary controllers for 2 dict's with a common key?

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