Help with XML Serialization

Guys I need help I have an ArrayList or Object full of managed-objects and I'm struggling to serialize it so I can layer the object into a XML document. I get an error:

{"The type VimApi.DynamicProperty was not expected. Use the XmlInclude or SoapInclude attribute to specify types that are not known statically."}

I suspect that its because the VimService.XMLSerializer is not being used in place of the standard .net XML.Serializer

Is there any examples of how to use VimService.XMLSerializer for a novice?

Thanks in advance.