Select List Add Item Bug In IE6 / Work Around It?

I have created a control that mimics a tree view control (i.e. expandable and collapsable items). In order to facilitate this functionality I am using a select list and using selectList.Add to add child options to their parent when the parent is double clicked, which works fine, however in IE6 after doing that the focus of the the select list jumps to the first item in the control, even though the item that was double clicked is still highlighted when I scroll back down to it. The only way I can get this code to work is by adding an alert after I have added the new item to the list, which is not a workable solution. The code works fine in IE7 and later. Anybody know a work around? I have pasted some code that highlights the issue below, just scroll down the list a while and double click one of the lower options, focus will jump back up to the top of the list. code...