Actions linked to + on connections tab

Hi
Is there any way to attach custom code to the “+” next to a document link in the “Connections” tab of a document ?

Use case …
When I am in Doc A, I want to click on the “+” next to Doc B ( in Connections) and then I want to “kick” some custom code to transfer some info from Doc A to Doc B.

I can do that by adding a custom button named “Create Doc B” but I would like to use the “+” in the connections tab.