To answer your question succinctly, no, the attention getter and the thesis are two separates parts usually found in the introduction of the essay. The attention getter is what interests the reader in the rest of the essay. It can be a quotation, an anecdote, an interesting fact. It should be a strong lead into what the subject of the essay is going to be. Af the end of the introductory paragraph, after relating the meaning and importance of your attention getter and tying it into your subject, the writer then states his claim, argument, or thesis whatever your instructor calls it. I prefer the claim sentence: You are telling the reader what you are going to writing about in your essay. For example, your claim/thesis might state: "Mastering the computer has become the most important task in education today." Your attention getter at the first of the paragraph would illustrate the importance of the computer to get the reader's attention.