Editable selectedboxedbox property does not update the user interface

Using javascript I am trying to change the selection of a list item this way:

 function selectFirstActiveListItem(oListBox)
    {
         for (var i = 0; i < oListBox.options.length; i++)
         {
            oListBox.selectedIndex = i;                

            var szStatus = GetDomboBoxItemAttribute("Status", m_pdocConnectType.getXMLDOM(), oListBox);

            if ("Enabled" == szStatus)
                return;
         }
         oListBox.selectedIndex = 0;
    }

      

        
        
        
      

    

Although the index changes correctly in the background, it is not reflected in the UI. The old selection is still displayed in the list.

What will go wrong?