-single select dialog for glass-popup-button; multi select with extra button:<br>
-[% P.part.picker('part_id31', undef, multiple=0) %]
+single select dialog for glass-popup-button; multi select with extra button (and limited to 5 results):<br>
+[% P.part.picker('part_id31', undef, multiple=0, multiple_limit=5) %]