Widget Hierarchy

    GObject
        GInitiallyUnowned
            GtkObject
                GtkWidget
                    GtkContainer
                        GtkBin
                            GtkWindow
                                GnomeScanAcquisitionDialog
                                GnomeScanDialog
                            GtkScrolledWindow
                                GnomeScanPreviewArea
                        GtkBox
                            GtkVBox
                                GnomeScanAdvancedPreview
                                GnomeScanPreview
                            GtkHBox
                                GnomeScanOptionWidget
                                    GnomeScannerSelector
                                    GnomeScanResolutionSelector
                                    GnomeScanSourceSelector