WPF External Assembly Resource Lookup Test Project

In this project I'm trying to access resouces from a separate Assembly.

The current version fails to do so.

The following line in MainWindow.xaml isn't working, no background color is being displayed:

<StackPanel Grid.Row="0" Background="{DynamicResource {ComponentResourceKey TypeInTargetAssembly={x:Type res:DummyForSharingResources}, ResourceId=TestBg}}"></StackPanel>

I published this repository seeking for help.

What I did so far

• "Themes/generic.xaml" file created in supplemental assembly (StylesAndResources), filled with resources.
• ThemeInfoAttribute updated in application assembly to reference ResourceDictionaryLocation.ExternalAssembly.
• Dummy class created in StylesAndResources in order to be able to have a ComponentResourceKey be generated.

What am I doing wrong?