Leadership issue is never black and white. And your question is on the very grey side. A good leader is the one who knows how to listen and who knows how to convince the team members. If you ask your team members and respect their answers they will bond to you further. Specially ask the the questions with answers already known by you and complete their sentences before they do. Asking questions on regular basis will get your team members accustomed to it. This is good when you need to ask a vital question for your decisions they will think it is part of the regular. They will not be suprised. Some specially directed questions will help you on your leadership as they lead your team members into supporting your decisions.

The worst thing is a team member challenging you. You can prevent this by asking him lots of questions.

You should be concerned but not emotional, alert but not excited, quick but not hasty and if you add a reasonable plan on this than no one questions your decisions.
When your decisions are undermined it is very dangerous. If you make your team members part of the decision they do not undermine themselves:) You should have sharp diplomatic skills for that and diplomacy is the ability to tell a person to go to hell in such a way that he looks forward to the trip <img src="images/graemlins/smile.gif" alt="" />

Burak