Use child properties for selecting the guest item

It looks like current the code uses the `name` property to decide if the selected listbox row is the guest item. This can cause problems since this is essentially used for the CSS ID property. We should use child properties or some other way of identifying this special row.

Start by locating the listbox row-selection logic and the check that identifies the guest item through its name property. Trace how the row's child properties are exposed, then confirm that guest-row selection no longer depends on the CSS ID-like name value.

Written by the indexing model from the issue text.