Using MVVM with new Ribbon Control Library

Hi,

As new ribbon for wpf http://www.microsoft.com/downloads/details.aspx?FamilyID=2BFC3187-74AA-4154-A670-76EF8BC2A0B4&displaylang=en is officially released, I am looking for a way to use new ribbon control library in my application respecting the MVVM pattern, I used ribbon 2007 repecting MVVM by extending the RibbonCommand with CanExecute and Exceute properties, but Microsoft has dumped RibbonCommand in new release. Any help on new Ribbon with MVVM is appreciated.