RadioButtonList.SelectedIndexChanged not raised when the ListItem has Selected="True"

I have a RadioButtonList that I am using inside an UpdatePanel. I have added the SelectedIndexChanged event of a RadioButtonList as a Trigger. Whenever I select a different ListItem, the UpdatePanel is updated, as it should, with one exception. When selecting the ListItem that has the Selected="True" attribute the SelectedIndexChanged event is not triggered. I have tested this by moving the Selected="True" attribute to a different ListItem, and then that ListItem did not trigger the UpdatePanel, and the one that I removed it from did. I need to have an initially selected ListItem, because it is used in determining certain other aspects of my initial page. Is there some workaround for this? Or is it just a bug in ASP.NET (or IE7, which is what I am currently testing with)? Any help would be appreciated. Thanks.

Nathan Sokalski
njsokalski@xxxxxxxxxxx
http://www.nathansokalski.com/

.