public interface ITypeEditor 

//Custom editors that are used as attributes MUST implement the ITypeEditor interface.
    public class FirstNameEditor : Xceed.Wpf.Toolkit.PropertyGrid.Editors.ITypeEditor
    {
        public FrameworkElement ResolveEditor(Xceed.Wpf.Toolkit.PropertyGrid.PropertyItem propertyItem)
        {
            TextBox textBox = new TextBox();
            textBox.Background = new SolidColorBrush(Colors.Red);

            //create the binding from the bound property item to the editor
            var _binding = new Binding("Value"); //bind to the Value property of the PropertyItem
            _binding.Source = propertyItem;
            _binding.ValidatesOnExceptions = true;
            _binding.ValidatesOnDataErrors = true;
            _binding.Mode = propertyItem.IsReadOnly ? BindingMode.OneWay : BindingMode.TwoWay;
            BindingOperations.SetBinding(textBox, TextBox.TextProperty, _binding);
            return textBox;
        }
    }

public partial class LastNameUserControlEditor : UserControl, ITypeEditor
    {
        public LastNameUserControlEditor()
        {
            InitializeComponent();
        }

        public static readonly DependencyProperty ValueProperty = DependencyProperty.Register("Value", typeof(string), typeof(LastNameUserControlEditor), 
                                                                                                new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.BindsTwoWayByDefault));
        public string Value
        {
            get { return (string)GetValue(ValueProperty); }
            set { SetValue(ValueProperty, value); }
        }        

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            Value = string.Empty;
        }

        public FrameworkElement ResolveEditor(Xceed.Wpf.Toolkit.PropertyGrid.PropertyItem propertyItem)
        {
            Binding binding = new Binding("Value");
            binding.Source = propertyItem;
            binding.Mode = propertyItem.IsReadOnly ? BindingMode.OneWay : BindingMode.TwoWay;
            BindingOperations.SetBinding(this, LastNameUserControlEditor.ValueProperty, binding);
            return this;
        }
    }

public class CustomAttributEditorPerson
        {
            [Category("Information")]
            [DisplayName("First Name")]
            [Description("This property uses a TextBox as the default editor.")]
            //This custom editor is a Class that implements the ITypeEditor interface
            [Editor(typeof(FirstNameEditor), typeof(FirstNameEditor))]
            public string FirstName { get; set; }

            [Category("Information")]
            [DisplayName("Last Name")]
            [Description("This property uses a TextBox as the default editor.")]
            //This custom editor is a UserControl that implements the ITypeEditor interface
            [Editor(typeof(LastNameUserControlEditor), typeof(LastNameUserControlEditor))]
            public string LastName { get; set; }
        }