setItemTooltip on UI.Combo not working with IE6

Hi,

I'd like to have tooltips on each item of my combo popup. The following code is OK with FF and IE7 but unfortunately tooltips do not display with IE6...

var dateCombo = new AW.UI.Combo;
    var dateFilters = ["aujourd"hui",  "demain",  "après-demain"];
    var dateValues = ["20080725","20080726","20080727"];
    dateCombo.setItemText(dateFilters);
    dateCombo.setItemValue(dateValues);
    dateCombo.setItemTooltip(dateFilters);
    dateCombo.setItemCount(dateFilters.length);
    document.write(dateCombo);

Does someone have a workaround for that?
Thank you in advance

UP!
Do you have an idea Alex?

I don't think there is a workaround for this - it looks like IE6 bug, IE6 does not show tooltips for any content in popup window.