How do I add a QGraphicsScene to a QGridLayout?

[di_zou]

I have this:

class MainWidget(QWidget):
    def __init__(self):
        self.tree = TreeArea(self)
        self.display = DisplayArea(self)
 
        gridLayout = QGridLayout()
        gridLayout.addWidget(self.tree, 0, 0)
        gridLayout.addWidget(self.display, 0, 1)

class MainWidget(QWidget):
    def __init__(self):
        self.tree = TreeArea(self)
        self.display = DisplayArea(self)
        
        gridLayout = QGridLayout()
        gridLayout.addWidget(self.tree, 0, 0)
        gridLayout.addWidget(self.display, 0, 1)

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where TreeArea is:

class TreeArea(QTreeWidget):
    def __init__(self, parent):
        QTreeWidget.__init__(self, parent)

class TreeArea(QTreeWidget):
    def __init__(self, parent):
        QTreeWidget.__init__(self, parent)

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and DisplayArea is:

class DisplayArea(QGraphicsScene):
    def __init__(self, parent):
        QGraphicsScene.__init__(self, parent)

class DisplayArea(QGraphicsScene):
    def __init__(self, parent):
        QGraphicsScene.__init__(self, parent)

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Qt doesn't like it when I do gridLayout.addWidget(self.display, 0, 1) since self.display does not inherit QWidget. So how do I add a QGraphicsScene to a layout?