Issue with ProgressRing initialization

[faeizazizi]

I'm trying to update to latest version of WPF-UI 4.0.1. I encounter issue with ProgressRing initialization which was not an issue before.

<ui:ProgressRing x:Name="ScanProgress" 
                 Grid.Column="2" 
                 Grid.Row="0"
                 Margin="4"
                 Width="16" 
                 Height="16" 
                 IsIndeterminate="True"/>

Exception:

System.Windows.Markup.XamlParseException
  HResult=0x80131501
  Message='Initialization of 'Wpf.Ui.Controls.ProgressRing' threw an exception.' Line number '267' and line position '42'.
  Source=PresentationFramework
  StackTrace:
   at System.Windows.Markup.XamlReader.RewrapException(Exception e, IXamlLineInfo lineInfo, Uri baseUri)

  This exception was originally thrown at this call stack:
    System.Windows.DependencyProperty.SetupOverrideMetadata(System.Type, System.Windows.PropertyMetadata, out System.Windows.DependencyObjectType, out System.Windows.PropertyMetadata)
    System.Windows.DependencyProperty.OverrideMetadata(System.Type, System.Windows.PropertyMetadata)
    Wpf.Ui.Controls.Arc.Arc()

Inner Exception 1:
TypeInitializationException: The type initializer for 'Wpf.Ui.Controls.Arc' threw an exception.

Inner Exception 2:
ArgumentException: Metadata override and base metadata must be of the same type or derived type.

How can I resolve this? Thanks in advance.

[gleclair]

I'm seeing the same thing. It also happens in the WPFGallery project that has all the examples, so I'm guessing it's not anything in your app (or mine).
Edit: Looks like the issue is in the static constructor for the Arc control. I created a PR with the fix.

[faeizazizi]

Thank you for the PR @gleclair !