gtk/gtk_since_3_10.go
func (v *HeaderBar) PackStart(child IWidget) {
	C.gtk_header_bar_pack_start(v.native(), child.toWidget())
}
func (v *HeaderBar) PackStart(child IWidget) {
	C.gtk_header_bar_pack_start(v.native(), child.toWidget())
}
// PackStart is a wrapper around gtk_header_bar_pack_start().