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    GObject
    ╰── GInitiallyUnowned
        ╰── GtkObject
            ╰── GtkWidget
                ╰── GtkContainer
                    ╰── GtkBox
                        ╰── GtkHBox
                            ├── GtkCombo
                            ├── GtkFileChooserButton
                            ├── GtkInfoBar
                            ╰── GtkStatusbar
GtkHBox is a container that organizes child widgets into a single row.
Use the GtkBox packing interface to determine the arrangement, spacing, width, and alignment of GtkHBox children.
All children are allocated the same height.