redo step:
open demo page: http://www.zkoss.org/zkdemo/combobox/simple_combobox
test with color combobox

1. set blue item
2. enter "black" into combobox => item black is selected
at handle function, call SelectEvent.getPreviousSelectedItems
it will return "black" item.
it's wrong, correct value is blue item.
if user mouse for select item, function return correct value.

reason:
client sent wrong value when make event, please reference attach file