private static void OnCommandParameterChangeCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            XamDataTree menuItem = d as XamDataTree;

            if (menuItem != null)
            {
                XamDataTreeCommandBehavior behavior = GetOrCreateCommandBehavior(menuItem);
                behavior.CommandParameter = e.NewValue;
            }
        }
        private static XamDataTreeCommandBehavior GetOrCreateCommandBehavior(XamDataTree menuItem)
        {
            XamDataTreeCommandBehavior behavior = menuItem.GetValue(SelectedCommandBehaviorProperty) as XamDataTreeCommandBehavior;

            if (behavior == null)
            {
                behavior = new XamDataTreeCommandBehavior(menuItem);
                menuItem.SetValue(SelectedCommandBehaviorProperty, behavior);
            }
            return(behavior);
        }