File list (Check if you may need any files):
TreeViewStepByStep\TreeViewStepByStep.sln
..................\TreeViewStepByStep.suo
..................\TreeViewStepByStep
..................\..................\App.xaml
..................\..................\App.xaml.cs
..................\..................\Properties
..................\..................\..........\AssemblyInfo.cs
..................\..................\..........\Resources.Designer.cs
..................\..................\..........\Resources.resx
..................\..................\..........\Settings.Designer.cs
..................\..................\..........\Settings.settings
..................\..................\TreeViewStepByStep.csproj
..................\..................\Window1.xaml
..................\..................\Window1.xaml.cs