Works great. Thanks!
I spent quite a few hours working on this question, because I'm a firm believer in RTFM.
I abandoned the "tracker" properties because they seemed to be the 8 shapes that appear when I select a shape.
A Google search for
nevron diagram selected shape style
does not return any results that lead to the answer.
I realize that search visibility is difficult. I understand that "RubberBandStrokeStyle" is its name, but no way for me to know that if I didn't know that the thing I was seeing is a static rubber band. I clicked the shape once to select it, so I wasn't thinking "rubber band". If I had dragged to select it, I might have associated that concept with the style.
Anyhow, the answer is in the Forum now.
Best regards,
Adam