QVTKOpenGLStereoWidget customContextMenuRequested not work

I am migrating my app from vtk 8.1 to vtk 9.0. In vtk 9 QVTKOpenGLWidget is replaced with QVTKOpenGLStereoWidget. To create a context menu in vtk 8.1 I used the code:
connect(m_View, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(ShowVTKContextMenu(const QPoint&)));
but it doesn’t work in vtk 9. What could be the problem?