Delete content widget in layout

[Hogwarts]

Hi
I'm trying to delete a widget or several widgets content in a QBoxLayout. How can I do this?

This is my code:

void CustomRadioButton::deleteOption(int pos)
{
    if(pos >= 0 && pos < getLayout()->count())
    {
        delete getLayout()->takeAt(pos);
        update();
    }
}

void CustomRadioButton::deleteOption(int pos)
{
    if(pos >= 0 && pos < getLayout()->count())
    {
        delete getLayout()->takeAt(pos);
        update();
    }
}

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I think I managed to delete the widget, but the layout do not updated visually. Any idea??
Thanks in advanced and excuse my English.