Silverlight & WPF

Is there any way to migrate a Silverlight app to a WPF app without too much code change? Like migrating Flex to Flex Air.

I looked a tutorial here: http://weblogs.asp.net/scottgu/pages/silverlight-tutorial-part-8-cr...
It does not help since my Silverlight app has controls from System.Windows.Controls (Silverlight specific) for example.

So the question is: can this be easily achieved? Or this is work in progress by MS?

Thanks!