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#include <gtk/gtk.h>
                    GtkHBox;
GtkWidget*          gtk_hbox_new                        (gboolean homogeneous,
                                                         gint spacing);
GObject +----GInitiallyUnowned +----GtkObject +----GtkWidget +----GtkContainer +----GtkBox +----GtkHBox +----GtkCombo +----GtkFileChooserButton +----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.