dropdownlist repeater control, can't glow selectedindexchanged

i have repeater control where footer i have dropdownlist. code-behind i have:

protected vacant ddmyrepeater_itemdatabound(object sender, repeateritemeventargs e)
{
    (e.item.itemtype == listitemtype.item
            || e.item.itemtype == listitemtype.alternatingitem)
    {
       // vigilant contracting code
    }

    else (e.item.itemtype == listitemtype.footer)
    {
        dropdownlist ddl = e.item.finddropdownlist("ddmydropdownlist");
        // fill list control
        ddl.selectedindexchanged += new  
           eventhandler(ddmydropdownlist_selectedindexchanged);
        ddl.autopostback = true;
    }
 }

the page seem postback however eventhandler does called. any ideas?