Styling QCheckBox inside QComboBox with stylesheet

[Olyver]

Hello everyone,

My question is about styling using StyleSheet.

I'm using a QStandardItemModel and populates it with QStandardItem with flag Qt::ItemIsUserCheckable.
That way, a checkbox appears next to each of my items in the QComboBox.

I would like now to style these checkboxes like all the others in my program. (the checked and unchecked indicators)

No success so far; I tried stuffs like the following without luck:
@
MyCustomComboBox::init(){
...
setItemDelegate(new QStyledItemDelegate());
setStyleSheet(
"QComboBox QAbstractItemView::item::QCheckBox::indicator:checked{"
" image: url(...);"
"}"
);
}
@

If you know a way to to it without implementing a delegate, I'd be happy to hear about it.

Thanks !