I have an ASCX control that has to render Silverlight dynamically. The dynamic code works in a non-MVC environment, however when I try to load the silverlight into an MVC ASCX, I get a ScriptManager error. However, my main aspx page does reference the masterpage, which has a script manager. I just need the control to realize that there will be a scriptmanager once it is plugged into the main page. I am trying to use a ScriptManagerProxy, but it is still looking for the ScriptManager. So, I think my biggest problem is getting the control to recognize the masterpage from the main page. Hopefully this explains my problem properly. If you need any code snippets, I can provide them
I don't think you should be using ScriptManager with MVC. ScriptManager is for Web Forms. There is a 3rd party one for MVC http://mvcscriptmanager.codeplex.com/.
I don't know that I quite understand what you are trying to accomplish. But you can use an IFrame (yuck) in your MVC page to display an aspx page.