To utilize Qt with FlowLine2 You should make the following modification: QTreeView::indexRowSizeHint has to be Digital; the correspondig line in qtreeview.h ought to seem like: Site legit???or ??is it|could it be|can it be} a scam Web-site???or ??is this|Is that this} a safe Web site???or ??is this site real?|Also fetching area values is much more