Object hierarchy

    GObject
        GInitiallyUnowned
            GtkObject
                GtkWidget
                    GtkDrawingArea
                        GpwCpu
                    WnckPager
                        GpwPager
                    GtkContainer
                        GtkBin
                            GtkWindow
                                GpwPanel
                            GtkButton
                                GtkScaleButton
                                    GtkVolumeButton
                                        GpwVolume
                        WnckTasklist
                            GpwTasklist
                    GtkMisc
                        GtkLabel
                            GpwStrftime
        GtkAction
            GpwQuit
            GpwShellCommand
            GtkToggleAction
                GpwShowDesktop