When I try the following code in C#

Infragistics.Win.OptionSetOptionButtonUIElement element = default(Infragistics.Win.OptionSetOptionButtonUIElement);
    
element = (Infragistics.Win.OptionSetOptionButtonUIElement)UltraOptionSet1.UIElement.ChildElements[0].ChildElements[xxx];
{
         element.Enabled = false;
         element.Invalidate();
}

There are never any elements in ChildElements above, even though I have 4 items in the "UltraOptionSet1".  Any Ideas?