I think you're right. But I'm going to do it differently now: That presentation was to be part of an analysis I have done on one month's invoices. It's likely I'll have to do this analysis in intervals now - for every month - and it's important that I can do it relatively fast and the presentation can be passed on to our business_partner. So I'll just have a number of slides in my app with just one pie_chart each, relatively simple, so that I can easily copy the objects to a ppt presentation.
Thanks a lot!