Capturing events when WPF contains WindowsFormsHost

I have a WPF program that includes a StackPanel that contains multiple WindowsFormsHost controls. The WindowsFormsHost controls sit on top of the WPF when running. I want to capture Stylus events in WPF so that I can pan through the different panels. These events never seem to fire. How do I capture these actions?

I have a similar app without the WindowsFormsHost controls that works great.

Dave Frey