How to Catch ASP.Net RadioButton CheckChanged Event in a DataGrid

Question

I have a RadioButton in a TemplateColumn of a DataGrid. Each RadioButton is part of the same group to make sure that only one is selected and they are set to AutoPostBack.

What I would like to do is trap the OnCheckedChange event and handle it like a button click within the DataGrid (using the OnItemCommand event handler).

Does anyone know a way to do this or am I stuck with just binding the OnCheckedChange event to another handler and then figuring out what I need to know by tracking back from the control that triggers the event (the "sender" parameter)?