title: Add Connecting Lines to WPF TreeView Programmatically (with no XAML)
body: <p>How might I do THIS: <a href="https://stackoverflow.com/questions/19560466/how-to-make-wpf-treeview-style-as-winforms-treeview">How to make WPF TreeView style as WinForms TreeView?</a> in code, with no XAML?  The reason I need to do this is the TreeView I have been given is defined in code, so there is no XAML at all.  While I can start with XAML, I do not know how to 'add XAML' to something that doesn't have it to begin with.  I am very new to WPF, but have been doing Winforms for years.  The TreeView is comprised only of a large hierarchy of TreeViewItem objects with Header and Tag values.</p>