private TreeViewItem BuildTreeViewItem(AbstractNode fileNode)
{
TreeViewItem viewNode = new TreeViewItem();
viewNode.Header = fileNode.Name;
if (fileNode.IsDirectory())
{
Action <AbstractNode> addFileNodeToViewNode = node => viewNode.Items.Add(BuildTreeViewItem(node));
fileNode.Children.ForEach(addFileNodeToViewNode);
}
return(viewNode);
}