Or better yet, just have the date range default to the current date so you can see invoices without having to reset the date range every time you view sales. If you click on view sales I would assume that you would like to be able to see the current sales and not just the sales from the last time you reset the filter, which you can't even do anymore. A filter should be used the way it is in all other applications, a way to narrow a search. By default the list should be complete and then you 'filter' the results if required.