My boy has developed an attitude, I know it's a stage, he figures every thing is his, and evrything revolves around him. Each time I take away something from him, he gets ready to cry, I don't give it back to him, because I don't want him to figure that that is the way to get the things he wants.

How old is he? It will end I promise you, but could be tough in the mean time. You are right to not want to encourage the behaviour but at the same time you might want to consider explaining to him why he cannot have it. It might seem at this point that explanations will be over his head, but more sinks in than you realise and it might ultimately help him accept things sooner.

Its always tough when they decide making a fuss is the way to get what they want. The best thing is to explain in simple terms why he cannot have it. "because I'm the mommy" doesn't count here ;) And then stand your ground no matter what. And make sure everyone else is doing the same thing. If he is made to behave at home but given into elsewhere its only going to undermine your parenting.