WIP: init.

src/Ursa/Controls/NavMenu/NavMenu.cs

@@ -0,0 +1,17 @@
+using Avalonia.Controls;
+using Avalonia.Controls.Primitives;
+
+namespace Ursa.Controls;
+
+public class NavMenu: SelectingItemsControl
+{
+    protected override bool NeedsContainerOverride(object? item, int index, out object? recycleKey)
+    {
+        return NeedsContainer<NavMenuItem>(item, out recycleKey);
+    }
+
+    protected override Control CreateContainerForItemOverride(object? item, int index, object? recycleKey)
+    {
+        return new NavMenuItem();
+    }
+}