gtk/gtk.go
func (v *Box) SetChildPacking(child IWidget, expand, fill bool, padding uint, packType PackType) {
	C.gtk_box_set_child_packing(v.native(), child.toWidget(), gbool(expand),
		gbool(fill), C.guint(padding), C.GtkPackType(packType))
}
func (v *Box) SetChildPacking(child IWidget, expand, fill bool, padding uint, packType PackType) {
	C.gtk_box_set_child_packing(v.native(), child.toWidget(), gbool(expand),
		gbool(fill), C.guint(padding), C.GtkPackType(packType))
}
// SetChildPacking() is a wrapper around gtk_box_set_child_packing().