A Gtk_Hbutton_Box is a specific Gtk_Button_Box that organizes its
children horizontally.
The beginning of the box (when you add children with Gtk.Box.Pack_Start)
is on the left of the box. Its end (for Gtk.Box.Pack_End) is on the right.
Types
type Gtk_Hbutton_Box isaccessall Gtk_Hbutton_Box_Record'Class;