How would I sync the horizontal scrolling of child tables? I don't want to use GridViewAutoSizeColumnsMode.Fill but I want the user to vertically scroll and have all the same child tables be lined up.
It is possible to use the horizontal scroll bar of the main template to manage for both templates. However, it is not recommended to use it in the case of a large amount of data as it may affect the performance when scrolling. The attached gif file illustrates better the implemented functionality.