listbox menupopup=auto when a column is hidden and the listheader is clicked for sorting, the hidden column re-appears

In zk sandbox, take a listbox example and edit code by adding menupopup="auto" on a listhead.
Then using this menupopup hide a column.
Then click on any other listheader to sort data...
Tada, the hidden column is shown
This is not the case with grid...