Object Hierarchy

    GObject
        GInitiallyUnowned
            ClutterActor
                MetaBackgroundActor
                MetaShapedTexture
                MetaWindowActor
            GtkWidget
                GtkContainer
                    GtkBin
                        MetaPreview
        MetaBackground
        MetaBarrier
        MetaDisplay
        MetaPlugin
        MetaScreen
        MetaShadowFactory
        MetaWindow
        MetaWorkspace
    GBoxed
        MetaBarrierEvent
        MetaKeyBinding
        MetaRectangle