gtk/gtk_since_3_10.go
func (v *HeaderBar) SetShowCloseButton(setting bool) {
	C.gtk_header_bar_set_show_close_button(v.native(), gbool(setting))
}
func (v *HeaderBar) SetShowCloseButton(setting bool) {
	C.gtk_header_bar_set_show_close_button(v.native(), gbool(setting))
}
// SetShowCloseButton is a wrapper around gtk_header_bar_set_show_close_button().