/// <summary>
/// Register/unregister chain. Implemented and sealed by <see cref="ZenTabbedForm"/>.
/// </summary>
/// <param name="ctrl">Control to register for showing tooltips.</param>
/// <param name="tt">Tooltip informatio provider. To show not tooltips, pass null.</param>
internal virtual void RegisterControlForTooltip(ZenControlBase ctrl, IZenTooltip tt)
{
ZenControlBase parent = Parent;
if (parent != null)
{
parent.RegisterControlForTooltip(ctrl, tt);
}
}
