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If I remember correctly, the tableview extension will scroll itself, so you do not need a scrolling arrangement or to set the screen scrollable. Just use a vertical arrangement and put your tableview in that. This might improve scrollbar visibility....which should show for a second or two when the tableview is initialised.
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If that is not enough, there may be an extension that can help to display scrollbars all the time, but you might just want to show a label or graphic to the user that the view is scrollable. Most mobile users tend to be "scroll happy" and will instinctively try and scroll things.
Also see here:
might just do what you are after