func (v *Box) PackStart(child IWidget, expand, fill bool, padding uint) {
	C.gtk_box_pack_start(v.native(), child.toWidget(), gbool(expand),
		gbool(fill), C.guint(padding))
}
func (v *Box) PackStart(child IWidget, expand, fill bool, padding uint) {
	C.gtk_box_pack_start(v.native(), child.toWidget(), gbool(expand),
		gbool(fill), C.guint(padding))
}
// PackStart() is a wrapper around gtk_box_pack_start().