There is no Theme.xaml file

[alexislom]

There is no such theme in AvalonStudio.Shell/Themes/ folder

which is needed in ShellExampleApp/App.paml for example.

Another problem is when I tried to customize platform-specific window (from this advice AvaloniaUI/Avalonia#776)

1. I added AvalonStudio.Shell 0.9.0-preview7 package

2. Added styles in App.xaml
   <StyleInclude Source="avares://AvalonStudio.Shell/Themes/BaseDark.xaml"/> <StyleInclude Source="avares://AvalonStudio.Shell/Themes/Accents/DarkAccent.xaml"/> <StyleInclude Source="avares://AvalonStudio.Shell/Icons/Icons.xaml"/> <StyleInclude Source="avares://AvalonStudio.Shell/Controls/MetroWindowTheme.paml" /> <StyleInclude Source="avares://AvalonStudio.Shell.Extensibility/Controls/ControlTheme.paml" /> <StyleInclude Source="avares://AvalonStudio.Shell/Styles/GlobalStyles.xaml" />

3. And derived MainWindow from AvalonStudio.Shell.Controls.MetroWindow

This is work on window, but doesn't work on mac
dotnet App.dll
Unhandled exception. System.NullReferenceException: Object reference not set to an instance of an object.
at AvalonStudio.Shell.Controls.MetroWindow..ctor()
at App.Views.MainWindow..ctor() in \Projects\App\Views\MainWindow.xaml.cs:line 9
at App.App.OnFrameworkInitializationCompleted() in \Projects\App\App.xaml.cs:line 14
at Avalonia.Controls.AppBuilderBase1.Setup() at Avalonia.Controls.AppBuilderBase1.SetupWithLifetime(IApplicationLifetime lifetime)
at Avalonia.ClassicDesktopStyleApplicationLifetimeExtensions.StartWithClassicDesktopLifetime[T](T builder, String[] args, ShutdownMode shutdownMode)
at NTS.Desktop.Program.Main(String[] args) in \Projects\App\Program.cs:line 12
Abort trap: 6