Sets or gets the current page.
Setting the currentPage property updates the visual indicator of the
pagination bar to display the current page. The currentPage cannot be
set to a value greater than totalPages.
If the pagination bar is connected to a dataset, setting currentPage
updates the current page of the dataset and updates any relevant
elements connected to that dataset.
Getting the currentPage property returns the index of the current page.
Note: Page numbers begin with 1.