Black screen when using vtkRenderWindowInteractor and vtkGenericOpenGLRenderWindow.

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Hi all.
I’m learning qt and vtk recently.
According to the tutorial in vtk examples, I successfully used vtkGenericOpenGLRenderWindow to draw vtk in qt.
Now I want to add MouseEvents. According to the MouseEvents in vtk examples, I need to use

  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("MouseEvents");

  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

  vtkNew<customMouseInteractorStyle> style;
  renderWindowInteractor->SetInteractorStyle(style);

This works fine in vtkRenderWindow,
but when I use vtkGenericOpenGLRenderWindow I get a black screen.
Mouse events still fire normally.

All I changed was replacing vtkRenderWindow with vtkGenericOpenGLRenderWindow in order to render into a Qtwidget.