Key press events not working with QVTKInteractor

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Hi, although mouse press events function as expected with QVTKInteractor, key press events are not being caught. Are there any working examples for QVTKInteractor?

QQuickVTKItem::vtkUserData MyVTKItem::initializeVTK(vtkRenderWindow* renderWindow) {
    ...
    vtkNew<QVTKInteractor> renderWindowInteractor;
    renderWindowInteractor->SetRenderWindow(renderWindow);
    renderWindowInteractor->Initialize();

    vtkNew<KeyPressInteractorStyle> style;
    style->SetDefaultRenderer(renderer);

    renderWindowInteractor->SetInteractorStyle(style);
    renderWindowInteractor->Start();

The above is a partial code listing where I have used vtk-examples/Cxx/Interaction/KeypressEvents.

Thanks!