allow new items to be added to sub menus at runtime, from a config file

Hyperbar.Windows.Primary/WidgetComponentViewModelEnumerator.cs

@@ -1,11 +1,28 @@
 namespace Hyperbar.Windows.Primary;
 
 public class WidgetComponentViewModelEnumerator(PrimaryWidgetConfiguration configuration,
-    IFactory<PrimaryCommandConfiguration, IWidgetComponentViewModel?> factory) :
+    IFactory<PrimaryCommandConfiguration, IWidgetComponentViewModel?> factory,
+    ICache<(Guid ParentId, Guid Id), PrimaryCommandConfiguration> cache) :
     IViewModelEnumerator<IWidgetComponentViewModel>
 {
     public IEnumerable<IWidgetComponentViewModel?> Next()
     {
+        Stack<(Guid, List<PrimaryCommandConfiguration>)> stack = new();
+        stack.Push((Guid.Empty, configuration.Commands));
+
+        while (stack.Count > 0)
+        {
+            (Guid currentParentId, List<PrimaryCommandConfiguration> currentConfigurations) = stack.Pop();
+            foreach (PrimaryCommandConfiguration configuration in currentConfigurations)
+            {
+                cache.Add((currentParentId, configuration.Id), configuration);
+                if (configuration.Commands is not null && configuration.Commands.Count > 0)
+                {
+                    stack.Push((configuration.Id, configuration.Commands));
+                }
+            }
+        }
+
         foreach (PrimaryCommandConfiguration item in configuration.Commands.OrderBy(x => x.Order))
         {
             yield return factory.Create(item);