use PropertyDescriptor

src/Shared/HandyControl_Shared/Controls/PropertyGrid/Editors/EnumPropertyEditor.cs

@@ -0,0 +1,22 @@
+using System;
+using System.Windows;
+using System.Windows.Controls.Primitives;
+
+namespace HandyControl.Controls
+{
+    public class EnumPropertyEditor : PropertyEditorBase
+    {
+        public override FrameworkElement CreateElement(PropertyItem propertyItem)
+        {
+            var picker = new System.Windows.Controls.ComboBox
+            {
+                IsEnabled = !propertyItem.IsReadOnly,
+                ItemsSource = Enum.GetValues(propertyItem.PropertyType)
+            };
+
+            picker.SetBinding(Selector.SelectedValueProperty, CreateBinding(propertyItem));
+
+            return picker;
+        }
+    }
+}

src/Shared/HandyControl_Shared/Controls/PropertyGrid/Editors/PropertyEditorBase.cs

@@ -11,12 +11,12 @@ namespace HandyControl.Controls
             new Binding(propertyItem.PropertyName)
             {
                 Source = propertyItem.Value,
-                Mode = GetBindingMode(),
-                UpdateSourceTrigger = GetUpdateSourceTrigger()
+                Mode = GetBindingMode(propertyItem),
+                UpdateSourceTrigger = GetUpdateSourceTrigger(propertyItem)
             };
 
-        public virtual BindingMode GetBindingMode() => BindingMode.OneWay;
+        public virtual BindingMode GetBindingMode(PropertyItem propertyItem) => propertyItem.IsReadOnly ? BindingMode.OneWay : BindingMode.TwoWay;
 
-        public virtual UpdateSourceTrigger GetUpdateSourceTrigger() => UpdateSourceTrigger.Default;
+        public virtual UpdateSourceTrigger GetUpdateSourceTrigger(PropertyItem propertyItem) => UpdateSourceTrigger.PropertyChanged;
     }
 }