While the answers from Nickoly and Saurabh are correct in what they state, I don't think they are answering your question exactly.
The problem is you are comparing a Content Delivery Page object with the SDL Tridion Content Manager Page object.
Technically speaking the CM Page is persisted in the CM storage (database), and a copy of it can be Published to the Presentation Server. There it is stored in the CD storage (could be Broker database or just as an HTML page on disk). So there isn't really a concept of a life cycle like you would have it compared to a Java or .Net Page object in web application.
What I'm reading between the lines of your question is that you want to do something with the Content Manager item that is being published. Maybe you can edit your question and supply that additional information (what do you want to do?), so we can give you a better suited answer?