public void SetLeftIndentLengthSettings()
        {
            var indentLength = TreeViewItemExtension.GetItemIndentLength(AttachedFrameworkElement);

            var count = AttachedFrameworkElement.FindAscendantCount <TreeViewItem, TreeView>();
            var leftIndentLengthDelta = count > 0 ? indentLength * count : 0;

            _templateSettings.SetValue(TreeViewItemTemplateSettings.ItemIndentThicknessDeltaProperty, new Thickness(leftIndentLengthDelta, 0, 0, 0));
        }