public DisclosureTriangle(FNSButton disclosureButton) : base(disclosureButton)
{
disclosureButton.TranslatesAutoresizingMaskIntoConstraints = false;
disclosureButton.SetButtonType(NSButtonType.PushOnPushOff);
disclosureButton.BezelStyle = NSBezelStyle.Disclosure;
disclosureButton.Title = string.Empty;
disclosureButton.Highlight(false);
}