private void AddNodeToTree(Roslyn.Compilers.VisualBasic.SyntaxNode codeNode, ItemsControl parent)
        {
            var newNode = new TreeViewItem();

            newNode.Header = codeNode.GetType().Name;
            newNode.ToolTip = codeNode.ToFullString();

            parent.Items.Add(newNode);

            foreach (var childCodeName in codeNode.ChildNodes())
            {
                AddNodeToTree(childCodeName, newNode);
            }
        }