Form validation of checkbox selection

I am using the pageflow example to create a multi-page form and use a form container on each pseudo page to force the user to complete the required fields before going to the next page.

There is an acknowledgement check-box on one of the pseudo pages that the user is required to select before advancing to the next page. Is it possible to do this with the standard widget, or does it require a custom widget.

Thank You!

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Setting the checkbox to required sets the form container invalid when the checkbox is not selected. The only downside to this is that there is no indication why the next page button is not enabled.