Silverlight 3 / Prism - 将枚举值作为命令参数传递

I'm trying to use Prism and the MVVM pattern to develop an application. In my UI, I have a previous and next button defined. For use in a calling web services, I've defined an enum that will tell me the direction I need to traverse. So, in this instance, the buttons map directly to an enum value. The enum definition is very simple and is as follows:I'm trying to use Prism and the MVVM pattern to