Here is the link to the tutorial.
This library is based on the following open source project: https://github.com/astuetz/PagerSlidingTabStrip License: http://www.apache.org/licenses/LICENSE-2.0 It is an alternative to StdViewPager. It is simpler to use and looks better. It is implemented as a custom view. It requires B4A v5.8+...
Also, a great portion of the learning comes from threads and posts related to this subject. In the search box of the forum, if you type 'tabstrip viewpager', you will get several pages of links to several threads. Many of them have code snippets that help.
You may also look in klaus's booklets, there may be some documentation there too.