Widget Hierarchy

    GObject
        GInitiallyUnowned
            GtkObject
                GtkWidget
                    GtkContainer
                        GtkBin
                            GtkWindow
                                GnomeScanAcquisitionDialog
                                GtkDialog
                                    GnomeScanDialog
                            GtkScrolledWindow
                                GnomeScanPreviewArea
                            GtkComboBox
                                GnomeScanSourceSelector
                        GtkBox
                            GtkVBox
                                GnomeScanAreaSelector
                        GtkTable
                            GnomeScanResolutionSelector