No No No, making something automatically it's not good idea, user must press enter, if not, press ESC to canceling process, but what's not good idea is make some automatic decission that could be a mistake ... user must confirm or deny himself not the system ( that's an usability requirement ). Of course I could autoconfirm on losing focus, but from by point of view is a bad decisión this kind of feature on use entry information ( because here we're supposing so much ).