This should be titled "Beginners guide to DHTMLX".
I've used DHTMLX for a while and eventually purchased the Professional Suite, which although it is used the same way, it is structured very differently. I expected this book to cover this difference, but it doesn't.
It first gets to grips with DHTMLX in chapter 4, which is on page 46 of 132, not leaving much room for the rest. If the online preview of this book included chapter 5, I would not have purchased this.
Considering this book covers UI components, the lack of images is very disappointing. e.g. Chapter 5 Toolbars: This is where you can put a toolbar (2 pics). These are items you can add to a toolbar (no pics). This is how to add those items to a toolbar (code but no pics). This is an example of a toolbar with two text buttons (pic of bar with 2 words on it, WOW!)
If you've seen the examples on the DHTMLX website, then you dont need this book.
I'm keeping this book for new members of staff to take home and read, but I read it in under 5 minutes.