Whenever you can show off in front your superiors or clients, you are promoting yourself. Your people have definitely noticed it. A good manager should be careful not to get mislead by people who can present their work better than they actually are. And he should also be careful not to behave in such a way himself.
4. You complain about everybody and everything
You may not realize that your approach to your people and work is contagious. The mood of the whole team can be a direct result of your behavior. Try a positive approach and see the difference.
5. You reveal confidential information
No employee, let alone a manager, should ever talk about confidential information he has learned in the company. The result would be an immediate loss of confidence, which is often unrecoverable. Once your people do not trust you, they will not do for you more than they have to.
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Article source Entrepreneur.com - website of a leading U.S. magazine for entrepreneurs