Ensure containers show up in the menu when they are created

Toolkit.Foundation/Activated.cs

@@ -1,3 +1,10 @@
 namespace Toolkit.Foundation;
 
-public record Activated;
+public record Activated<TValue>(TValue? Value = default);
+
+public record Activated
+{
+    public static Activated<TValue> As<TValue>(TValue value) => new(value);
+
+    public static Activated<TValue> As<TValue>() where TValue : new() => new(new TValue());
+}