Object Hierarchy

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