public IHtmlNode ButtonTag()
{
string title = string.IsNullOrEmpty(DatePicker.ButtonTitle) ? "Open the calendar" : DatePicker.ButtonTitle;
return new HtmlTag("a")
.Attributes(new { href = "#", title = title, tabindex = "-1" })
.AddClass(UIPrimitives.Link, UIPrimitives.Icon, "t-icon-calendar")
.Text("select date");
}