Object Hierarchy

    GObject
        GtkObject
            GtkWidget
                GtkContainer
                    GtkBox
                        GtkVBox
                            GimpPreview
                                GimpAspectPreview
                                GimpScrolledPreview
                                    GimpDrawablePreview
                GtkProgress
                    GtkProgressBar
                        GimpProgressBar
            GtkAdjustment
        GtkStyle
        GdkDragContext
        GdkScreen
    GInterface
        AtkImplementorIface