Up Button not covered

In Chapter 6, it says this: “(Wondering about the Up button? We will discuss how to implement and configure this button in Chapter 14.)”

However, I have read Ch 14 and done an electronic search for it, and the “Up Button” is not mentioned at all. It was there in the previous edition. In my opinion, it should be there still.

Please advise, thanks.

I concur. There are a number of features that were removed between editions. With regards to the CriminalIntent app