Pluggable system for providing WPF controls inside the Entity Manager

Torch.Server/ViewModels/Entities/EntityControlViewModel.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+
+namespace Torch.Server.ViewModels.Entities
+{
+    public class EntityControlViewModel : ViewModel
+    {
+        internal const string SignalPropertyInvalidateControl =
+            "InvalidateControl-4124a476-704f-4762-8b5e-336a18e2f7e5";
+
+        internal void InvalidateControl()
+        {
+            // ReSharper disable once ExplicitCallerInfoArgument
+            OnPropertyChanged(SignalPropertyInvalidateControl);
+        }
+
+        private bool _hide;
+
+        /// <summary>
+        /// Should this element be forced into the <see cref="Visibility.Collapsed"/>
+        /// </summary>
+        public bool Hide
+        {
+            get => _hide;
+            protected set
+            {
+                if (_hide == value)
+                    return;
+                _hide = value;
+                OnPropertyChanged();
+            }
+        }
+    }
+}