The treeview demo app is still in 4.2 version, I would suggest to upgrade to 5 or higher? When I Install the widget the editing window does not allow to thixe widget pane to move/scale, Its hard to set/edit all items in low part of the widget. Should be not so hard to fix. Michel Weststrate seems to be owener... I have now a version running on 6.9.1 (I can share it) but it runs with errrors (I had to replace all presistant create actions) I will get it working...