I added Xceed Extended WPF Toolkit via Nuget and I get a "A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll" which when I looked into it, found that it was looking for Xceed.Wpf.Toolkit.Luna.
Everything seems to work without this assembly.
Comments: ** Comment from web user: emartin **
Everything seems to work without this assembly.
Comments: ** Comment from web user: emartin **
Another [issue here](https://wpftoolkit.codeplex.com/workitem/20156)