在ASP.NET MVC中动态添加ViewUserControl

I am wondering if there are any known issues with adding a ViewUserControl at run time (to a ViewPage). It works fine if I add the control declaritively but not if I add the control programmatically (in the code behind file in this case). I don't get an error, it just does not render the control but stepping through the debugger does confirm that the relevant methods in the page life cycle are being called.I am wondering if there are any known issues wi