How to set widgets as children items on QTreeView

[wysota]

However I was asking about how I can add widget as "CHILDREN" to QTreeView (or I might better say "How can I use widgets as hierarchical tree nodes on QTreeView"). I managed to figure out as I posted it already. Any thoughts about it is appreciated!

Actually you were asking about how to add widgets as children of the view's viewport. And that's what setIndexWidget does. Which is what you shouldn't do as I already said. You have 5 items here. Try doing that for 5000 items.