Added to the first post 
ViewPager is like a Scroll View (either horizontal or vertical) which hosts only one child view at a time.
This one can be termed as a Horizontal View Pager:
ChangeLog Version 1.1
New Blocks
Changes
- Added
idsystem - Dynamic Components support
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Can a HorizontalViewPager extension be made to behave the same way as the Vertical one, i.e. reacts to user swipe right/left, as opposed to it being automated ? It is more natural to swipe left/right, and AppInventor already has a vertical "scroll" of sorts....
Or perhaps both in one extension ?
Yes, possible
I was hoping my enquiry might encourage you to make a horizontal one 
3 Likes
most excellent work
(a few of the tool tip/descriptions might need editing)
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Actually it (extension) is different from current thread so I may publish it someday else.
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ChangeLog Version 1.2
New Blocks
2 Likes
When I tried using both HorizontalViewPager and VerticalViewPager in the same project I got attached error..
Can I use both with each other?
Not currently, they are essentially the same extension with a few tweaks. The horizontal view pager has not been officially released as a separate extension by @vknow360
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Thank you.
Looks like this "index" is 0-based, better to change to 1-based, as same to other app inventor component.
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Yes, fixable in Horizontal one but can't do the same with Vertical ViewPager as it will break a lot of blocks.
Dear @vknow360,
How to swipe tab bar with the change of view page in horizontalview pager. Like this
You can do that with the help of PageChanged event.
Ok thanks
Why can't I run demo
Have you updated your companion app to 2.67 / 2.67u ?
I just bulid and run