[vtkusers] delete renderer

[G G]

Hello,
I load data to QVTKWidget. It is ok, but data stays in memory when I load
new image.

When I reload new image my application crashed :(
I tried to delete like this
qVTK1->GetRenderWindow()->GetRenderers()->Delete(); // qVTK1 is QVTKWidget

Does somebody know, how to delete or remove last renderers in each new
loading I add renderer to renderwindow for example

        vtkSmartPointer<vtkImageActor> actor =
vtkSmartPointer<vtkImageActor>::New();
        actor->SetInput(output->GetOutput());

        vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
        renderer->SetBackground(1,1,1);
        renderer->AddActor(actor);

        qVTK1->GetRenderWindow()->AddRenderer(renderer);
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