Ah I see.  What I am trying to accomplish is for each Owner to be able to each have their own "availability" defined.  I would like to for a given date/time and owner, color the background of the TImeSlotUIElements to some color to indicate this availability status.

So I guess what I need to do is to loop through the visible TimeSlotUIElements for each Owner and to color them accordingly.  What would be the best way to find the TimeSlotUIElements per Owner?  I have tried something like:

DayView.UIElement.GetDescendant(typeof(Infragistics.Win.UltraWinSchedule.DayView.TimeSlotUIElement), new object[ { targetTimeSlot, targetOwner} );

But this seems to always return null.  What would be the proper way to get at the TimeSlotUIElement in this case?

A TimeSlot object does not represent a physical manifestation, so there is no one-to-one relationship between an Owner and a TimeSlot; since the control can display multiple days as well as multiple owners, there is no one-to-one relationship between a TimeSlot and a date, either.

The TimeSlotUIElement, on the other hand, connects a TimeSlot with a date and optionally an Owner. The following code sample uses the DayUIElement and AllDayEventAreaDayUIElement elements to return the Owner at the specified client coordinates:

 /// <summary>
/// Returns the Owner at the specified point, or null if there
/// is no Owner at the specified point.
/// </summary>
/// <param name="dayView">The UltraDayView control to test.</param>
/// <param name="point">The point the test, expressed in client coordinates.</param>
private Owner OwnerFromPoint( UltraDayView dayView, Point point )
{
    UIElement controlElement = dayView != null ? dayView.UIElement : null;
    UIElement elementAtPoint = controlElement != null ? controlElement.ElementFromPoint( point ) : null;
    UIElement dayElement = null;
    UIElement allDayElement = null;

    while ( elementAtPoint != null )
    {
        dayElement = elementAtPoint as Infragistics.Win.UltraWinSchedule.DayView.DayUIElement;
        if ( dayElement != null )
            break;

        allDayElement = elementAtPoint as Infragistics.Win.UltraWinSchedule.DayView.AllDayEventAreaDayUIElement;
        if ( allDayElement != null )
            break;

        elementAtPoint = elementAtPoint.Parent;
    }

    UIElement elementToCheck = dayElement != null ? dayElement : allDayElement;

    return elementToCheck != null ?
        elementToCheck.GetContext( typeof(Owner) ) as Owner :
        null;
}

Note that you could use the TimeSlotUIElement as well, although this example is more efficient because it does not require searching through as many elements as would be necessary when using TimeSlotUIElements.