Improve item selection for add-business day function

Function to add a business day: While this function is used, the business-day list should always select (and) show the relevant business-day.

Todo * When user clicks on 'add' then the business-day list must select and scroll to the new item * When user clicks on 'save' then the business-day list is refreshed and the new item is sorted to somewhere in the list (currently on top). The list must select and scroll to the new item after refresh, too.