This one is sneaky and I another forum participant hadn't asked about it--prompting me to open the file and investigate, I wouldn't know how it works. They place an invisible Slider control inside the popover frame. The code here is selecting different panels of that slider, not the popover frame.
Thanks Phil, that did it. I had to double click on the object in which the portal was located - I was accidentally selecting only the popover frame or the portal and wasn't finding the slider control located within the popover frame and which contained the portal and search field. When I finally found and double clicked the slider control, the slider control panel appeared. So in summary, there are 3 layers/objects to be aware of: the popover frame, the slider control frame, and the portal/fields. Thanks again.