#### Classes Hierarchy

- `GObject.Object`

- `GObject.InitiallyUnowned`
  - `Gtk.Widget`
    - `Container`
      - `Billboard`
      - `LeadContainer`
        - `TitleHeader`
      - `SimpleControls`
    - `ExtraMenuButton`
    - `Gtk.Button`
      - `NextItemButton`
      - `PreviousItemButton`
      - `ToggleFullscreenButton`
      - `TogglePlayButton`
    - `SeekBar`
    - `TitleLabel`
    - `Video`