The role of the manager is not to change the personalities of her employees to fit into a mold. But inevitably, you will be tasked with managing personalities who are just plain difficult. From the guy with the huge ego who thinks he knows more than you do to the talented loner who refuses to collaborate, some people do not want to be managed - and they may respond poorly to your efforts to do so.
How to react? By adopting one of the responses below.