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: serj1980 **
Everything seems to work without this assembly.
Comments: ** Comment from web user: serj1980 **
I investigate this on my environment. If I comment DockingManager control, error not occured. If I uncomment DockingManager and comment all internal for DockingManager controls (leave empty DockingManager), error occured.
I moved from original AvalonDock to xceed. With original assembly I don't have this error.