I have 5 DropDownLists and they all work great in IE9, but in IE8 one of them does not drop down. I tried adding the following to its open event as I saw suggested for a similar issue for another control, suspecting it might be a z-index issue, but it didn't help. This dropdownlist is configured identically to some of the others, except that it queries a different web service to populate it. Unfortunatly, the users that will be using this are all using IE8. All of the dropdowns are inside a tabstrip.