Silverlight XAML对象的二进制序列化

I'm working on Silverlight application that needs to display complex 2d vector graphics. It downloads zipped XAML file from the server, parses it (XamlRead) and injects to the layout root on the page. This works fine for fairly small xaml files. The problems is that I need to make it work with much bigger file (lots more content in it). For example one of my uncompressed xaml files is 20 MB large and XamlRead method takes tool long to parse it. My question is if is there a way to do all the parsing on the server side. It would best to just store serialized binary output of XamlRead method as BLOB in the database. However when I try to serialize it, I'm getting a message that "Canvas object is not marked as serializable". I will really appreciate any advices . I'm working on Silverlight application that nee