Client Side Event Handlers Appear to Short Circuit RadioButton Server Side Handled

ASP.Net 2.0 RadioButton

I had a handler for the body tag's OnLoad event and that did not seem to conflict with the Page_Load server event. In that event I did something like this:

document.getElementById("rbDocView").onclick=function(){ RadioClick();}
document.getElementById("rbItemView").onclick=function(){ RadioClick();}
RadioClick();

Once I added this the server side CheckChanged event stopped firing.