[vtkusers] growing RAM memory

[G G]

Hi, I loading data to QVTKWidget
I have some inicialization method.

void GUI::widgetInicialization(QVTKWidget *widget, vtkRenderer *ren)
{
    vtkRenderWindow *renwin = vtkRenderWindow::New();
    ren = vtkRenderer::New();
    renwin->AddRenderer(ren);
    widget->SetRenderWindow(renwin);
    widget->update();
    renwin->Delete();
}

Then I load some data and display it...

    vtkSmartPointer<vtkRenderer> renderer =
vtkSmartPointer<vtkRenderer>::New();
    renderer->AddActor(actor);
    widget->GetRenderWindow()->AddRenderer(renderer);
    widget->GetRenderWindow()->Render();

But when I load some data previous data stay in renderer? How to delete
renderer?
I try before each data loading call this method...

void GUI::widgetInicialization(QVTKWidget *widget, vtkRenderer *ren)
{
    try
    {
        widget->GetRenderWindow()->Delete();
    }
    catch(...)
    {}
    vtkRenderWindow *renwin = vtkRenderWindow::New();
    ren = vtkRenderer::New();
    renwin->AddRenderer(ren);
    widget->SetRenderWindow(renwin);
    widget->update();
    renwin->Delete();
}

but any reasons :(
Do you hepl me please how to delete renderers?

Thank you
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