On all recent notebooks you can scroll with the touchpad by using two fingers at the same time. This works well on almost all applications, and also on all WinForms and WPF applications.
It seems that the C++ and C# versions do not set the scrollable regions correctly, so the touchpad driver does not know that he is above a scrollable region and does not send scroll events.
I already have users complaining about this. This is really important. Many notebook users have got very used to using the touchpad for scrolling. If this does not work in an application, this is very confusing for them. I hope this can get resolved quickly.