It was towards the end of 2010, Bruce Wayne had just come back from certain death (a body had been discovered at the end of Final Crisis that Superman verified was Batman).  Dick Grayson (NIghtwing) had taken on the role of Batman in his absence.  So how do you decide who’s Batman?  You don’t!  If you're  Bruce Wayne you not only have 2 Batmans (Batmen?), you hold a press conference to announce that you are the financial backer behind Batman.  You also announce that “Batman” is starting an international crime fighting force under the banner of “Batman Incorporated”.  All this, the brain child of writer Grant Morrison, took place in the final pages of Batman & Robin #16 (November 2010).