public void SetUp()
{
center = Rectangle.FromCenter(0.5f, 0.5f, 0.5f, 0.1f);
scrollbar = new Scrollbar(center);
scrollbar.Add(new FontText(Font.Default, "", new Rectangle(0.5f, 0.7f, 0.2f, 0.1f)));
scrollbar.Start <DisplayScrollbarValue>();
InitializeMouse();
}