System.Windows.Controls.SelectionMultiple.SelectPreviousFromKey C# (CSharp) Метод

        public bool SelectPreviousFromKey()
        {
            List<MultiSelectTreeViewItem> items = MultiSelectTreeView.RecursiveTreeViewItemEnumerable(treeView, false, false).ToList();
            MultiSelectTreeViewItem item = treeView.GetPreviousItem(GetFocusedItem(), items);
            return SelectFromKey(item);
        }