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Programmatically Setting CheckedIndex on an UltraOptionSet

I am trying to set the CheckedIndex for the UltraOptionSet control.

Stepping through the debugger, when I first reach the line of code, the CheckedIndex value is -1.

The code then sets the value to 1.

The value immediately goes back to zero.

If I go to the locals window and change the CheckedIndex value to 1, it again goes right back to 0.

There are 3 items in the list but I cannot get the value to change.

What am I missing here. All the samples show setting the CheckedIndex.

Please help