public class AttachedPropertyHelper

    {

        public static DependencyProperty IsLeafProperty = DependencyProperty.RegisterAttached(

            "IsLeaf",

            typeof(bool),

            typeof(AttachedPropertyHelper),

            new FrameworkPropertyMetadata(null)

            );

        public static void SetIsLeaf(DependencyObject obj, bool value)

        {

            obj.SetValue(AttachedPropertyHelper.IsLeafProperty, value);

        }

        public static bool GetIsLeaf(DependencyObject obj)

        {

            return (bool)obj.GetValue(AttachedPropertyHelper.IsLeafProperty);

        }



        public static DependencyProperty MouseDoubleClickProperty = DependencyProperty.RegisterAttached(

            "MouseDoubleClick",

            typeof(ICommand),

            typeof(AttachedPropertyHelper),

            new FrameworkPropertyMetadata(null, new PropertyChangedCallback(MouseDoubleChanged))

            );

        public static void SetMouseDoubleClick(DependencyObject obj, ICommand value)

        {

            obj.SetValue(AttachedPropertyHelper.MouseDoubleClickProperty, value);

        }

        public static ICommand GetMouseDoubleClick(DependencyObject obj)

        {

            return (ICommand)obj.GetValue(AttachedPropertyHelper.MouseDoubleClickProperty);