Object Hierarchy

    GObject
    ╰── GInitiallyUnowned
        ╰── GtkObject
            ╰── GtkWidget
                ├── GtkEntry
                   ╰── GtkDataEntry
                ├── GtkContainer
                   ├── GtkTextView
                      ╰── GtkDataTextView
                   ╰── GtkSheet
                ╰── GtkSheetColumn
    GBoxed
    ╰── GtkSheetRange