first commit

MainWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Styling;
+
+namespace MercuryConverter;
+
+using MercuryConverter.Views;
+
+public partial class MainWindow : Window
+{
+    public string RunType
+    {
+        get
+        {
+            if (Design.IsDesignMode)
+            {
+                return "In Design!";
+            }
+            return "In Runtime.";
+        }
+    }
+
+    public MainWindow()
+    {
+        InitializeComponent();
+
+        // Force dark mode in designer
+        if (Design.IsDesignMode)
+        {
+            RequestedThemeVariant = ThemeVariant.Dark;
+        }
+        // LblPlatform.Content = RunType;
+
+        // Setup tab views
+        SelectionControl.Content = new Selection();
+    }
+}