interacción qvtkwidget con un control deslizante

I have a problem with qvtkwidget. I have a cube with the vtkimageplanewidget and i already made the connection between the sliders and them, but I want the slider to change also when I change the planes with the mouse in the qvtkwidget.

¿Cómo puedo hacer eso?

Here's how I connected the slider eith the planes.

RANURA:

void planevolume::SplaneXpixel()
{
    double xvalue=ui->Slider->value();
    planeX->SetSliceIndex(xvalue);
    ui->qvtkWidget->update();
}

y entonces:

  connect(ui->Slider, SIGNAL(valueChanged(double)), this, SLOT(SplaneXpixel()));

What about the opposite? I tried:

RANURA:

void planevolume::planeXSpixel()
{
    double xvalue=planeX->GetSliceIndex();
    ui->Slider->setValue(xvalue);
    ui->qvtkWidget->update();
}

y entonces:

connect(ui->qvtkWidget, SIGNAL(mouseEvent(QMouseEvent*)), SLOT(planeXSpixel()));

but it won't work, can anyone help me?