@TommyCarlier:And they started this project a long time ago. Visual studio 2010 would not have been ready (or proven) by then.
I am working on a WPF application, but the graphs are winforms because they are blazing fast. As yet there are no high performance WPF charts (apart from D3 which has stopped development). In fact in all but 1 WPF application I have worked on they have all been WPF/Winforms hybrids. Sometimes a better control is just that...better.