gtkButtonBoxGetLayout(object)
gtkButtonBoxGetChildSize(object)
gtkButtonBoxGetChildIpadding(object)
gtkButtonBoxGetChildSecondary(object, child)
gtkButtonBoxSetLayout(object, layout.style)
gtkButtonBoxSetChildSize(object, min.width, min.height)
gtkButtonBoxSetChildIpadding(object, ipad.x, ipad.y)
gtkButtonBoxSetChildSecondary(object, child, is.secondary)