The Architecture should support multiple viewers and each viewer reading its specific configuration. Having to create a placeholder and then create N multiple viewers to be used on each works but isn’t as nice. I can have a requirement to change the extent of all maps every time I pan on one of them. This is a common requirements for Operational Picture Control Centres and would be difficult to achieve when having different ASPX with different viewer inside it. We need a single Silverlight application with different Maps. I don’t even mind if the Backoffice does not support it in the next iterations. As long as it is possible through code easily.