Microsoft.Silverlight.Testing.Controls.TreeViewItem.FindNextFocusableItem C# (CSharp) Метод

        private TreeViewItem FindNextFocusableItem(bool recurse)
        {
            // Look for the next item in the children of this item (if allowed)
            if (recurse && IsExpanded && HasItems)
            {
                TreeViewItem item = ItemContainerGenerator.ContainerFromIndex(0) as TreeViewItem;
                if (item != null)
                {
                    return item.IsEnabled ?
                        item :
                        item.FindNextFocusableItem(false);
                }
            }

            // Look for the next item in the siblings of this item
            ItemsControl parent = ParentItemsControl;
            if (parent != null)
            {
                // Get the index of this item relative to its siblings
                TreeViewItem item = null;
                int index = parent.ItemContainerGenerator.IndexFromContainer(this);
                int count = parent.Items.Count;

                // Check for any siblings below this item
                while (index++ < count)
                {
                    item = parent.ItemContainerGenerator.ContainerFromIndex(index) as TreeViewItem;
                    if (item != null && item.IsEnabled)
                    {
                        return item;
                    }
                }

                // If nothing else was found, try to find the next sibling below
                // the parent of this item
                TreeViewItem parentItem = ParentTreeViewItem;
                if (parentItem != null)
                {
                    return parentItem.FindNextFocusableItem(false);
                }
            }

            return null;
        }