Combo boxes still not closing in Firefox‎

Hi
I'm still having the problem Combo boxes not closing in Firefox‎. This topic has been discussed several times but it is still not working for me.

usersgrid.setPopupTemplate(function(col, row) {
var grid = this;
var list = new AW.UI.List;
var data1 = ["de", "en", "fr", "it", "es"];
list.setItemText(data1);
list.setItemCount(data1.length);
list.setSize(80, 100);

list.onItemClicked = function(event, i) {
var text = this.getItemText(i);
grid.setCellText(text, col, row);
grid.setCellValue(text, col, row);
grid.getCellTemplate(col, row).hidePopup();

}
return list;
});

Any ideas?

Thank you...