If you want to control a scrollviewer from left-to-right instead top-to-bottom,you can use this trick.
Set ScrollViewer HorizontalScrollBarVisibility property as:
HorizontalScrollBarVisibility="Visible"
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By default,its set to "Disabled".
This will help you to navigate from left-to-right and opposite right-to-left
If you have a Grid bigger than ScrollViewer,then you'll be applying a Panorama-like effect
Hope this trick helps!