fixed #459

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

@@ -126,7 +126,7 @@ namespace HandyControl.Controls
         {
             if (obj == null || _itemsControl == null) return;
 
-            _dataView = CollectionViewSource.GetDefaultView(TypeDescriptor.GetProperties(obj).OfType<PropertyDescriptor>()
+            _dataView = CollectionViewSource.GetDefaultView(TypeDescriptor.GetProperties(obj.GetType()).OfType<PropertyDescriptor>()
                 .Where(item => PropertyResolver.ResolveIsBrowsable(item)).Select(CreatePropertyItem)
                 .Do(item => item.InitElement()));
 

src/Shared/HandyControl_Shared/Controls/PropertyGrid/PropertyItem.cs

@@ -6,7 +6,7 @@ using HandyControl.Data;
 
 namespace HandyControl.Controls
 {
-    public class PropertyItem : Control
+    public class PropertyItem : ListBoxItem
     {
         public static readonly DependencyProperty ValueProperty = DependencyProperty.Register(
             "Value", typeof(object), typeof(PropertyItem), new PropertyMetadata(default(object)));
@@ -107,15 +107,6 @@ namespace HandyControl.Controls
             set => SetValue(EditorElementProperty, value);
         }
 
-        public static readonly DependencyProperty IsSelectedProperty = DependencyProperty.Register(
-            "IsSelected", typeof(bool), typeof(PropertyItem), new PropertyMetadata(ValueBoxes.FalseBox));
-
-        public bool IsSelected
-        {
-            get => (bool)GetValue(IsSelectedProperty);
-            set => SetValue(IsSelectedProperty, ValueBoxes.BooleanBox(value));
-        }
-
         public static readonly DependencyProperty IsExpandedEnabledProperty = DependencyProperty.Register(
             "IsExpandedEnabled", typeof(bool), typeof(PropertyItem), new PropertyMetadata(ValueBoxes.FalseBox));
 

src/Shared/HandyControl_Shared/Controls/PropertyGrid/PropertyItemsControl.cs

@@ -2,8 +2,16 @@
 
 namespace HandyControl.Controls
 {
-    public class PropertyItemsControl : ItemsControl
+    public class PropertyItemsControl : ListBox
     {
         protected override bool IsItemItsOwnContainerOverride(object item) => item is PropertyItem;
+
+        public PropertyItemsControl()
+        {
+#if !NET40
+            VirtualizingPanel.SetIsVirtualizingWhenGrouping(this, true);
+            VirtualizingPanel.SetScrollUnit(this, ScrollUnit.Pixel);
+#endif
+        }
     }
 }