It would be useful to see some blocks at work in an aia project, and also a video of how this works.
What is a ViewPager?
Given this is for a vertical viewpager, is there already a horizontal one ?
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Awesome.
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Nice
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Great extension.
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Remembered this post 
Nice Extension Ser 
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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:
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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 
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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
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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