How to show relationships in my application?

I am developing my MS Access database editor (mdb, accdb), which I will give to everyone for free. I did basically everything that matters, except relationships. The problem for me is how to show relationships (relationships). I would like to do this as in real MS Access:

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The fact is that I don’t know how to connect these child windows with a line that stretches and resizes when one of the windows moves, etc.

This may not be a question that may have a direct answer, but I am stuck here and do not know how to show this relationship. I am using C ++ Builder XE2.

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