1. No need to repost, follow at one place: how to go through this article
You can use 'Improve Question' link to edit/update your question.
2. It looks like you want to ask this question to an author related to his/her article. I would suggest you to please use the forum present at the end of the article in order to reach author and get quick response. Rarely you will find authors reading this forum. So, please post the same at the article's message forum.
3. Did you download the sample code attachment present on the article and tried out (instead of copy-pasting code and trying)? May be you get to see the whole working and implementation there itself clarifying your doubts.