In the attached code (modified version of the Hello Graphs example), a QML scene containing a GraphsView is rendered in a GUI containing a QQuickWidget and some further widget controls. One of the widgets is a checkbox that controls the orientation property of the GraphsView. When clicked, it sets the property using QQmlProperty::write and calls QQuickWidget::update().

However, the change in orientation is not reflected in the graphics until the window is resized. On the other hand, modifying other aspects of the graph such as the values or the barsType property is reflected directly in the graphics, as shown by the attached demo.