Interesting article - Careers: Lead Like Fonzie: FastCompany Now, a few thoughts from the article.
Communicate. Share as much as you can about the situation at hand. People don’t like to be left in the dark when it comes to important issues. Make sure you maintain clear channels of communication.
Reassure. Don’t assume your team doesn’t need to hear that everything is going to be okay. They might not have access to the same information as you do and they might cling to assumptions and rumors without your reassurance.
Remain calm. Remember, all eyes are on you. What you say is important, but how you react can have even greater impact. Take a few seconds to take the emotion out of the situation and gather your thoughts before you respond verbally or nonverbally. Then maintain your calm throughout. It’s amazing how comforting this behavior will be on your team.