In Qt and specifically the QCalendarWidget the disabled(unclickable) dates by default have a grey background. However, I need to style those with a QSS file.

My problem is that I can't find the attribute in the Qt API. For example the items for selection and in general can be styled as such

```
QAbstractItemView {
    color:#444;
    alternate-background-color: #eee;
    selection-background-color: #0F4A8C;
    selection-color:#fff;
}

```

Any suggestion how could I set the background color of a disabled item?