Make custom widgets independent of any WinUI framework concerns. Although one can add WinUI concerns to ther widget if they want to build a fully customized widget. In theory, it may also be possible to host a widget of WPF, Avalonia, or Blazor.

Hyperbar.Windows/Views/WidgetView.xaml.cs

@@ -0,0 +1,10 @@
+using Microsoft.UI.Xaml.Controls;
+
+namespace Hyperbar.Windows;
+
+public sealed partial class WidgetView :
+    UserControl,
+    IWidgetView
+{
+    public WidgetView() => InitializeComponent();
+}