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    GObject
    ╰── GInitiallyUnowned
        ╰── GtkObject
            ╰── GtkWidget
                ╰── GtkContainer
                    ╰── GtkBox
                        ╰── GtkVBox
                            ├── GtkColorSelection
                            ├── GtkFileChooserWidget
                            ├── GtkFontSelection
                            ├── GtkGammaCurve
                            ╰── GtkRecentChooserWidget
A GtkVBox is a container that organizes child widgets into a single column.
Use the GtkBox packing interface to determine the arrangement, spacing, height, and alignment of GtkVBox children.
All children are allocated the same width.