Looking for examples of subclassing a QTreeView

[tbscope]

There's a very nice example of subclassing a view:
http://doc.qt.nokia.com/4.7/itemviews-chart.html

But I would first try if it is possible to use a delegate.
You also might want to find out if you can just put another treeview inside an index, that would make it a lot easier to implement.