A question on databinding

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Hi all!

How can I show a field from a third table? Let me explain better what I want
to do.

My database has the following tables:

Table A - the main table that is shown in the form. It has a field that is a
key into Table B;
Table B - it is related to Table A and it is a combobox in the form. It has
a field that is a key into Table C;
Table C - it is related to Table B and it has a description field to show in
a textbox.

So, my question is, how can I make the binding to the textbox that is on
Table C? What I want is to show the description field from Table C, whose key
is on the Table B (combobox).

Thank you,
Vanessa