Frontend page group dialogues linger after page selection

[justparking]

e.g. a page group set up like this groups the pages nicely, but when the group dialogue shows up and it's clicked, it lingers and has to be manually closed by clicking elsewhere.

…
  <pagegroup title="Zones">
    <page title="Zone 1">
…
    <page title="Zone 2">
…
    <page title="Zone 3">
…
  </pagegroup>
…