wpftoolkit/ExtendedWPFToolkitSolution/Src/WPFToolkit.Extended/PropertyGrid/Implementation/Editors/ItemsSourceAttributeEditor.cs

using System;
using Microsoft.Windows.Controls.PropertyGrid.Attributes;

namespace Microsoft.Windows.Controls.PropertyGrid.Editors
{
    public class ItemsSourceAttributeEditor : TypeEditor<System.Windows.Controls.ComboBox>
    {
        private readonly ItemsSourceAttribute _attribute;

        public ItemsSourceAttributeEditor(ItemsSourceAttribute attribute)
        {
            _attribute = attribute;
        }

        protected override void SetValueDependencyProperty()
        {
            ValueProperty = System.Windows.Controls.ComboBox.SelectedValueProperty;
        }

        protected override void ResolveValueBinding(PropertyItem propertyItem)
        {
            SetItemsSource();
            base.ResolveValueBinding(propertyItem);
        }

        protected override void SetControlProperties()
        {
            Editor.DisplayMemberPath = "DisplayName";
            Editor.SelectedValuePath = "Value";
        }

        private void SetItemsSource()
        {
            Editor.ItemsSource = CreateItemsSource();
        }

        private System.Collections.IEnumerable CreateItemsSource()
        {
            var instance = Activator.CreateInstance(_attribute.Type);
            return (instance as IItemsSource).GetValues();
        }
    }
}