Multi Page in WPF

I'm developing mutliple apps (C#/WPF) now and I'm always bothering about one thing:

If you wanna use multiple pages (like step by step stuff) theres no clean way to do that. Mostly I'm using a frame in my main-window (with a static navigation function) and the content are pages.

For sharing data between the pages I use a static class with variables and properties in my VM or directily in code-behind (depending on which I use).

Is there a better way to handle that? How do you do this kind apps?

Thanks, DK