Selecting a default value in a ComboBox?

For the question above, I know how to do what I want as the final result...I just think it would take more code than necessary which is the reason for this question.

I have 2 ComboBox controls on my windows form (see attached image). They are bound to a DataTable and contain two identical items each.

"Tension"
"Compression"

What I need to happen:

When the user selects a value from either CB, the other CB needs to show ONLY the other value. Is there a quick way of doing this without using alot of code?
Screenshot.jpg