Update MahApps.Metro from Version 0.13.1 to a higher one

Question

I wanted to finally update my MahApps.Metro with the NuGet Manager for my Project. In one WPF Window I use the FlipView Control and when I update Metro I always end up with an NullPointer Exception in the FlipView class.

It does not matter if I update to version 0.14 or 1.0.0 or 1.5.0 - it always crashes.

When I exclude the FlipView it starts but every window I call with .ShowDialog() does not show up.

Did anyone experienced the same?

Answer 1

Question can be closed, answer is here on GitHub

Summary: I used a custom Style Template which caused the trouble. Removing it solved the problem.