Editobj 2 includes also a Tkinter Tree Widget, highly optimized and with a GNU Linux-friendly look-and-feel.
It is written in pure-Python, and has been inspired by Guido's IDLE tree widget, but adds some features :
highly optimized (supports more than 10000 nodes !)
asynchronous rendering
GNU Linux-friendly look-and-feel
inheritance-based interface
The same module also provides a scrollpane, that can be used to add scrollbars for a Tkinter Frame.